A method for correcting the cylinder liner extraction force and a test system

Abstract

The present invention relates to the technical field of plunger pumps, and in particular, to a method for correcting the cylinder liner ejection force and a test system. The method includes establishing a sample model based on the sample size parameters of the plunger pump assembly. After the sample model is established, simulation ejection force data Y1 and test ejection force data Y2 are obtained. Based on the simulation ejection force data Y1 and the test ejection force data Y2, a first prediction formula is obtained. Based on the first prediction formula and the sample model, a second prediction formula is obtained. Based on the second prediction formula and the sample model, a correction formula is obtained. Based on the correction formula and the actual size parameters of the plunger pump assembly, predicted ejection force data is obtained. In this way, the problem of how to reduce the error between the simulated ejection force and the actual ejection force is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and more particularly, to a method for correcting the ejection force of a cylinder bushing and a test system therefor. Background Art

[0002] A plunger pump mainly consists of components such as a plunger, a cylinder block, and a bushing. Since the plunger reciprocates within the cylinder block, a wear-resistant bushing needs to be installed in the plunger cavity of the cylinder block to extend the service life of the plunger pump. The bushing of the plunger pump is generally press-fitted into the plunger cavity of the cylinder block by means of cold extrusion. After cold extrusion is completed, a press-ejection test needs to be carried out to test the ejection force to ensure the strength and reliability of cold extrusion. The ejection force is measured by a tensile testing machine and a tooling to conduct a destructive test on the bushing.

[0003] The structures of the existing cylinder block and bushing of the plunger pump before cold extrusion processing are mainly determined by the experience of necking processing. There are a large number of models of cylinder blocks and bushings, and it is difficult to determine the structural reliability of the cylinder bushing after cold extrusion only by experience. The error between the simulated ejection force data obtained by performing a simulation calculation of the ejection force of the cylinder bushing using simulation software and the actual ejection force data obtained from the press-ejection test is relatively large, making it difficult for the simulated ejection force data to reflect the structural reliability of the cylinder bushing. This empirical design method and the cost of verification after design are relatively high, and the process is complex, which is not conducive to the rapid development of the plunger pump and affects the design and R & D efficiency. Summary of the Invention

[0004] 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 method for correcting the ejection force of a cylinder bushing and a test system therefor.

[0005] In a first aspect, the present invention provides a method for correcting the ejection force of a cylinder bushing, the method for correcting the ejection force of the cylinder bushing 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 amount data C, and width data D; data of A, B, C, and D are obtained within a set range;

[0007] Step S20, after the sample model is established, obtaining simulated ejection force data Y1 and test ejection force data Y2;

[0008] Step S30: Obtain a first prediction formula based on the simulated release force data Y1 and the test release force data Y2. 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 both 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.

[0009] Step S40: Obtain a second prediction formula based on the first prediction formula and the sample model. 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: Obtain a correction formula based on the second prediction formula and the sample model. The correction formula is: Y3 = Y 1，REVISE + (J2 - K2)×B + J3×C + (N2 - M2) - Z; Z is a compensation parameter.

[0011] Step S60: Obtain predicted release force data based on the correction formula, the actual size parameters of the plunger pump assembly, and the simulated release force data. The actual size parameters include height data B and interference amount data C; data of B and C are obtained within a set range.

[0012] In some embodiments, step S10 includes:

[0013] Step S11: Obtain a physical model based on the sample size parameters of the plunger pump assembly.

[0014] Step S12: After obtaining the physical model, obtain thickness data A, height data B, interference amount data C, and width data D respectively. The thickness data A is within the thickness range, the height data B is within the height range, the interference amount data C is within the interference amount range, and the width data D is within the width range.

[0015] Step S13: Establish a simulation model based on the thickness data A, the height data B, the interference amount data C, and the width data D. The sample model includes the simulation model and the physical model.

[0016] In some embodiments, 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 amount range is 0.005 mm to 0.02 mm; the width range is 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 ejection force data Y1 and the P2 value corresponding to the test ejection force data Y2; wherein, the P1 value includes the P A1 value corresponding to the thickness data A, the P B1 value corresponding to the height data B, the P C1 value corresponding to the interference amount data, and the P D1 value corresponding to the width data D; the P2 value includes the P A2 value corresponding to the thickness data A, the P B2 value corresponding to the height data B, the P C2 value corresponding to the interference amount data, and the P D2 value corresponding to the width data D;

[0019] Step S42, based on that both the P A1 value and the P C1 value are greater than the first set threshold, and both the P A2 value and the P D2 value are greater than the second set threshold, obtain the 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.

[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 ejection force data Y1 and the P4 value corresponding to the test ejection force data Y2; wherein, the P3 value includes the P B3 value corresponding to the height data B and the P D3 value corresponding to the width data; the P4 value includes the P B4 value corresponding to the height data B and the P C4 value corresponding to the interference amount data C;

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

[0023] In some embodiments, the step S50 includes:

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

[0025] In some embodiments, the step S20 includes:

[0026] Step S21, after the establishment of the sample model is completed, run the simulation component;

[0027] Step S22, after the operation of the simulation component is completed, obtain the simulation ejection force data Y1;

[0028] Step S23, after the establishment of the sample model is completed, conduct an ejection test on the plunger pump assembly;

[0029] Step S24, based on the ejection test of the plunger pump assembly, obtain the test ejection force data Y2.

[0030] In some embodiments, the step S24 includes:

[0031] Step S241, based on the ejection test of the plunger pump assembly, position and fix the plunger pump assembly on the test bench and control the pressurizing unit to abut against the bushing unit of the plunger pump assembly;

[0032] Step S242, based on the abutment of the pressurizing unit against the bushing unit, control the pressurizing unit to continue moving a set distance in the direction close to the bushing unit at a set speed;

[0033] Step S243, after the pressurizing unit moves a set distance in the direction close to the bushing unit and maintains for a set time, obtain the maximum force borne by the bushing unit as the test ejection force data Y2.

[0034] In some embodiments, the set speed in step S242 is 2 mm / min; the set distance is 20 mm; 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 method for correcting the ejection force of a cylinder bushing according to any one of the above embodiments. The test system includes:

[0036] A plunger pump assembly, the plunger pump assembly including a cylinder block unit and a bushing unit; the cylinder block unit including a cylinder body and a boss groove; a cavity with one end open is formed inside the cylinder body; a boss groove is provided on the inner side wall of the cylinder body; the bushing unit including a bushing ring and a boss ring; the two bushing rings are respectively fixedly connected to both ends of the boss ring; the outer peripheral side of the bushing ring is in interference fit with the inner peripheral wall of the cylinder body;

[0037] The boss ring includes 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 the end close to the second ring portion towards the other end; the cross-sectional area of the third ring portion gradually decreases from the end close to the second ring portion towards the other end;

[0038] The plunger pump assembly further 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 from the 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 bottom of the boss groove, and the outer peripheral walls of the first ring portion and the third ring portion respectively abut against the peripheral side walls of the boss groove;

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

[0040] A simulation assembly for performing simulation operations on the plunger pump assembly and obtaining simulation ejection force data;

[0041] The test system further includes an ejection test state; the ejection test state includes the test bench positioning and fixing the cylinder body, and the pressurizing unit moving towards the direction close to the bushing ring.

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

[0043] A limited number of sample models are established based on the sample size parameters of the plunger pump assembly, so as to obtain the simulated ejection force data and the 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, lowering the test cost, and improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 FIG. shows a schematic flow chart of a method for correcting the ejection force of a cylinder liner according to an embodiment;

[0045] Figure 2 FIG. shows a detection schematic diagram of a test assembly and a plunger pump assembly according to an embodiment;

[0046] Figure 3 FIG. shows a schematic diagram of a bushing unit and a cylinder block unit of a plunger pump assembly before machining according to an embodiment;

[0047] Figure 4 FIG. shows a schematic diagram of a bushing unit and a cylinder block unit of a plunger pump assembly after machining according to an embodiment;

[0048] Figure 5 FIG. shows a schematic diagram of the change law of the acting force borne by a plunger pump assembly during an ejection test according to an embodiment.

[0049] Reference numerals: 01 plunger pump assembly; 11 cylinder block 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 described with reference to several exemplary embodiments. It should be understood that these embodiments are described only to enable those of ordinary skill 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 "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. are based on the orientations or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being used to represent orientations or positional relationships, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to 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, the meaning of "a plurality of" is two or more.

[0052] In the present embodiment, as Figure 2 shown, the plunger pump assembly 01 includes a cylinder block unit 11 and a bushing unit 12. As Figure 3 , Figure 4 shown, the cylinder block unit 11 includes a cylinder body 111 and a boss groove 112. A cavity with one end open 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 respectively fixedly connected to both ends of the boss ring 122. The outer peripheral side of the bushing ring 121 is in 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 further includes a first state and a second state. As Figure 3 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. As Figure 4 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 respectively abut against the peripheral side walls of the boss groove 112.

[0054] The bushing unit 12 is press-fitted into the cylinder block unit 11 by cold extrusion. After cold extrusion, a press-off test is also required to test the press-off force to ensure the strength and reliability of cold extrusion. Based on the premise of reducing test costs and improving efficiency, there is a large error between the simulation press-off force data obtained by existing simulation software and the test press-off force data obtained by actual tests, making the simulation press-off force data unable to be directly used as data support for reflecting the reliability of the cylinder bushing structure. How to reduce the error between the predicted press-off force and the actual press-off force of the bushing is the problem we need to solve. For this reason, this embodiment discloses a method for correcting the press-off force of a cylinder bushing.

[0055] As Figure 1 shown, the method for correcting the press-off force of a cylinder bushing includes steps S10 to S60, which will be described in detail below:

[0056] Step S10, based on the sample size parameters of the plunger pump assembly 01, establish a sample model. Among them, the sample model includes thickness data A, height data B, interference amount data C, and width data D. A, B, C, and D obtain data within the set range. As Figure 3As shown, the thickness data A can be the difference between the inner diameter and the outer diameter of the bushing ring 121. The height data B can 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 amount data C can be the interference amount of the interference fit between the outer peripheral wall of the bushing unit 12 and the inner peripheral wall of the cylinder block unit 11. The width data D can be the dimension of the boss ring 122 in the axial direction.

[0057] Step S20, after the sample model is established, obtain the simulated disengagement force data Y1 and the test disengagement force data Y2.

[0058] Step S30, based on the simulated disengagement force data Y1 and the test disengagement force data Y2, obtain the first prediction formula. Among them, 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. Both 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 the second prediction formula. Among them, the second prediction formula is: Y 1，REVISE = M2 + K2×B + K4×D, Y 2，REVISE = N2 + J2×B + J3×C. Both M2 and N2 are constants.

[0060] Step S50, based on the second prediction formula and the sample model, obtain the correction formula. Among them, 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 disengagement force data and the test disengagement force data.

[0061] Step S60, based on the correction formula, the actual dimension parameters of the plunger pump assembly 01, and the simulated disengagement force data, obtain the predicted disengagement force data. Among them, the actual dimension parameters include the height data B and the interference amount data C; data of B and C are obtained within the set range.

[0062] In some embodiments, taking the data of 16 groups of sample models and running the above steps can obtain as shown in Table 1:

[0063] Table 1 - Relationship between sample model, simulated disengagement force, and test disengagement force

[0064]

[0065] Through the parameters of A, B, C, and D in each group listed in Table 1, perform simulation and extraction tests, and conduct regression analysis on the simulated extraction force data Y1 and the test extraction force data Y2, so as to deduce the first prediction formula and substitute the correlation coefficients:

[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, variance analysis can be performed on the first prediction formula, and then the second prediction formula can be corrected and the correlation coefficients can be substituted:

[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] By further correcting and fitting the second prediction formula, according to Y 2，REVISE -Y 1，REVISE Obtain the correction formula and substitute the correlation coefficients:

[0073] When Z = 0, ;

[0074] When Z = K4×D, .

[0075] Finally, after substituting the corresponding data, the predicted extraction force data can be obtained. As shown in Table 2:

[0076] Table 2 - Relationship between sample model, simulated extraction force, test extraction force, and predicted extraction force

[0077]

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

[0079] In this embodiment, step S10 includes:

[0080] Step S11, based on the sample size parameters of the plunger pump assembly 01, an entity model is obtained. The entity model can be used to conduct an ejection test to promote the derivation process of the first prediction formula and the second prediction formula.

[0081] Step S12, after the entity model is obtained, thickness data A, height data B, interference amount data C, and width data D are respectively obtained. Among them, the thickness data A is within the thickness range, the height data B is within the height range, the interference amount data C is within the interference amount range, and the width data D is within the width range. Thus, it provides data support for subsequent fitting and deriving formulas.

[0082] Step S13, based on the thickness data A, height data B, interference amount data C, and width data D, a simulation model is established. Among them, the sample model includes a simulation model and an entity model.

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

[0084] In this embodiment, 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 amount range is 0.005 mm to 0.02 mm. The width range is 5 mm to 5.6 mm.

[0085] The error between the predicted ejection force data obtained by substituting the data acquired within the above range into the correction formula and the test ejection 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, the P1 value corresponding to the simulated ejection force data Y1 and the P2 value corresponding to the test ejection force data Y2 are obtained. Among them, the P1 value includes the P A1 value corresponding to the thickness data A B1The P corresponding to the value and the interference amount data C1 The P corresponding to the value and the width data D D1 Value. The P2 value includes the P corresponding to the thickness data A A2 Value, the P corresponding to the height data B B2 Value, the P corresponding to the interference amount data C2 Value, the P corresponding to the width data D D2 Value.

[0088] Step S42, based on P A1 Value, P C1 Values are all greater than the first set threshold, P A2 Value, P D2 Values are all greater than the second set threshold, obtain the second prediction formula. Among them, 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.

[0089] In some embodiments, in the process of performing an analysis of variance on the first prediction formula according to Table 1 to derive the second prediction formula, the following can be obtained as shown in Table 3:

[0090] Table 3 - Analysis of variance of simulation ejection force and test ejection force

[0091]

[0092] In Table 3, using the F statistic and the corresponding degrees of freedom, look up 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 the 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 ability of the factor for the response variable.

[0093] The P1 value corresponding to the simulation ejection force data Y1 and the P2 value corresponding to the test ejection force data Y2 can be obtained according to the above formula, so as to determine the influence degree 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, it is possible to judge whether each value among the P A1 value, P B1 value, P C1 value, P D1 values is greater than the first set threshold; judge whether the P A2 value, P B2 value, P C2 value, P D2Whether each value between the values is greater than a second set threshold; both the first set threshold and the second set threshold can be 0.05. Thus, P A1 value, P C1 value, P A2 value, P D2 value's corresponding data variables are removed from the first prediction formula, and then the second prediction formula is obtained. 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 release force data Y1 and the P4 value corresponding to the test release force data Y2. Among them, the P3 value includes the P B3 value corresponding to the height data B and the P D3 value corresponding to the width data. The P4 value includes the P B4 value corresponding to the height data B and the P C4 value corresponding to the interference amount data C. This is convenient for further simplifying the formula and reducing the amount of calculation later.

[0097] Step S52, based on the P D3 value being greater than a third set threshold, obtain the correction formula. Wherein, 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 obtaining the second prediction formula by fitting according to Table 3, a regression model variance analysis can be performed on the second prediction formula to derive the correction formula, as shown in Table 4:

[0099] Table 4 - Variance analysis of the corrected simulated release force and test release force

[0100]

[0101] In Table 4, the P D3 value is greater than the third set threshold, and the corresponding data variable can be removed from the second prediction formula to obtain the correction formula, thereby further simplifying the calculation, reducing the amount of calculation, improving efficiency, and not affecting the accuracy of the predicted release force data.

[0102] In this embodiment, step S50 includes:

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

[0104] The corrected formula derived through the above steps retains the consideration of the width data D and can improve the accuracy of the predicted ejection force data calculated by the corrected formula.

[0105] In this embodiment, step S20 includes:

[0106] Step S21, based on the completion of the establishment of the sample model, run the simulation component. Among them, the simulation component can use simulation software such as ABAQUS and ANSYS to perform simulation ejection force calculations to obtain simulation ejection force data Y1.

[0107] Step S22, based on the completion of the operation of the simulation component, obtain the simulation ejection force data Y1. This can facilitate the derivation of the first prediction formula.

[0108] Step S23, based on the completion of the establishment of the sample model, conduct an ejection test on the plunger pump assembly 01. So that the subsequent obtained predicted ejection force data can be compared with the data to ensure data reliability.

[0109] Step S24, based on the ejection test of the plunger pump assembly 01, obtain the test ejection force data Y2. Through the above steps, it provides data support for the subsequent derivation of the formula.

[0110] In this embodiment, step S24 includes:

[0111] Step S241, based on the ejection test of the plunger pump assembly 01, position and fix the plunger pump assembly 01 on the test bench 21 and control the pressurizing unit 22 to abut against the bushing unit 12 of the plunger pump assembly 01. To prevent the plunger pump assembly 01 from loosening during the ejection test.

[0112] Step S242, based on the abutment of the pressurizing unit 22 and the bushing unit 12, control the pressurizing unit 22 to continue moving a set distance in the direction close to the bushing unit 12 at a set speed. Thereby, a force can be exerted on the bushing unit 12.

[0113] Step S243, based on the pressurizing unit 22 moving a set distance in the direction close to the bushing unit 12 and maintaining it for a set time, obtain the maximum force borne by the bushing unit 12 as the test ejection force data Y2.

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

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

[0116] In this embodiment, this embodiment discloses a test system, and the test system is applied to a method for correcting the withdrawal force of a cylinder liner in any one of the above embodiments. As Figure 2 、 Figure 3 、 Figure 4 shown, the test system includes: a plunger pump assembly 01, a test assembly 02, and a simulation assembly.

[0117] The plunger pump assembly 01 includes a cylinder block unit 11 and a bushing unit 12. The cylinder block unit 11 includes a cylinder body 111 and a boss groove 112. A cavity with one end open 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. Two bushing rings 121 are respectively fixedly connected to both ends of the boss ring 122. The outer peripheral side of the bushing ring 121 is in 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 the 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 the end close to the second ring portion 1222 to the other end.

[0119] The plunger pump assembly 01 further includes a first state and a second state. As Figure 3 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. As 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 greater 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 respectively abut against the peripheral side walls of the boss groove 112.

[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 operations on the plunger pump assembly 01 and obtain simulation ejection force data.

[0122] The test system further includes an ejection test state. The ejection test state includes the test bench 21 positioning and fixing the cylinder body 111, and the pressurizing unit 22 moving in a direction close to the bushing ring 121. Through the above settings, an ejection test and simulation operations can be performed on the plunger pump assembly 01, so that simulation ejection force data Y1 and test ejection force data Y2 can be obtained. Furthermore, the first prediction formula and the second prediction formula are successively fitted, and finally a correction formula is obtained by correction fitting, and the predicted ejection force data can be calculated, reducing the test process and the amount of calculation, and improving the test efficiency.

[0123] Those of ordinary skill in the art can understand that the above embodiments are specific cases for implementing the present disclosure, and in practical applications, various changes can be made in form and details without departing from the scope of the present disclosure.

Claims

1. A method for correcting the removal force of a cylinder liner, characterized in that, The method for correcting the cylinder bushing extraction force includes: Step S10: Based on the sample size parameters of the plunger pump assembly, establish a sample model. Among them, the sample model includes thickness data A, height data B, interference amount data C, and width data D. Data for A, B, C, and D are obtained within the set ranges. The thickness data A is the difference between the inner diameter and the outer diameter of the bushing ring. The height data B is the difference between the inner diameter of the second ring part of the boss ring and the inner diameter of the bushing ring. The interference amount data C is the interference amount of the outer peripheral wall of the bushing unit and the inner peripheral wall of the cylinder block unit in interference fit. The width data D is the dimension of the boss ring along the axial direction. Step S20: After the sample model is established, obtain the simulated extraction force data Y1 and the test extraction force data Y2. Step S30: Based on the simulated extraction force data Y1 and the test extraction force data Y2, obtain the first prediction formula. Among them, 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 both 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. J1, J2, J3, and J4 are the first test coefficient, the second test coefficient, the third test coefficient, and the fourth test coefficient respectively. Step S40, obtain a second prediction formula based on the first prediction formula and the sample model; wherein, the second prediction formula is: Y 1，REVISE = M2 + K2 × B + K4 × D, Y 2，REVISE = N2 + J2 × B + J3 × C; both M2 and N2 are constants; Step S50, obtain a correction formula based on the second prediction formula and the sample model; wherein, the correction formula is: Y3 = Y 1，REVISE + (J2 - K2) × B + J3 × C + (N2 - M2) - Z; Z is a compensation parameter; Step S60: Based on the correction formula, the actual size parameters of the plunger pump assembly, and the simulated extraction force data, obtain the predicted extraction force data. Among them, the actual size parameters include height data B and interference amount data C.

2. The method for correcting the cylinder bushing extraction force according to claim 1, wherein Step S10 includes: Step S11: Based on the sample size parameters of the plunger pump assembly, obtain a solid model. Step S12: After obtaining the solid model, respectively obtain the thickness data A, height data B, interference amount data C, and width data D. Among them, the thickness data A is within the thickness range, the height data B is within the height range, the interference amount data C is within the interference amount range, and the width data D is within the width range. Step S13: Based on the thickness data A, the height data B, the interference amount data C, and the width data D, establish a simulation model. Among them, the sample model includes the simulation model and the solid model.

3. The method for correcting the cylinder bushing extraction force according to claim 2, wherein 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 amount range is 0.005 mm to 0.02 mm; the width range is 5 mm to 5.6 mm.

4. The method for correcting the cylinder bushing extraction force according to claim 1, wherein Step S40 includes: Step S41, based on the first prediction formula and the sample model, obtain the P1 value corresponding to the simulated ejection force data Y1 and the P2 value corresponding to the test ejection force data Y2; wherein, the P1 value includes the P A1 value corresponding to the thickness data A, the P B1 value corresponding to the height data B, the P C1 value corresponding to the interference amount data, and the P D1 value corresponding to the width data D; the P2 value includes the P A2 value corresponding to the thickness data A, the P B2 value corresponding to the height data B, the P C2 value corresponding to the interference amount data, and the P D2 value corresponding to the width data D; Step S42, based on the P A1 value and the P C1 value both being greater than a first set threshold value, and the P A2 value and the P D2 value both being greater than a second set threshold value, 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.

5. The method for correcting the cylinder bushing extraction force according to claim 4, wherein Step S50 includes: Step S51: Based on the second prediction formula and the sample model, obtain the P3 value corresponding to the simulated ejection force data Y1 and the P4 value corresponding to the test ejection force data Y2; wherein, the P3 value includes the P B3 value corresponding to the height data B and the P D3 value corresponding to the width data; the P4 value includes the P B4 value corresponding to the height data B and the P C4 value corresponding to the interference amount data C; Step S52, based on the said P D3 value being greater than a third set threshold value, obtain a correction formula; wherein, the said correction formula is: Y3 = Y 1，REVISE + (J2 - K2) × B + J3 × C + (N2 - M2) - Z; Z = 0.

6. The method for correcting the cylinder bushing extraction force according to claim 4, wherein The step S50 includes: Step S54, based on the second prediction formula, the sample model, and the P D3 value being less than or equal to a third set threshold, obtain a correction formula; wherein, the correction formula is: Y3 = Y 1，REVISE + (J2 - K2) × B + J3 × C + (N2 - M2) - Z; Z = K4 × D.

7. A method for correcting the removal force of a cylinder bushing according to claim 1, characterized in that The step S20 includes: Step S21, after the sample model is established, run the simulation component; Step S22, after the simulation component runs, obtain the simulated removal force data Y1; Step S23, after the sample model is established, conduct a removal test on the plunger pump assembly; Step S24, after the removal test is conducted on the plunger pump assembly, obtain the test removal force data Y2.

8. A method for correcting the removal force of a cylinder bushing according to claim 7, characterized in that The step S24 includes: Step S241, when conducting the removal test on the plunger pump assembly, position and fix the plunger pump assembly on the test bench and control the pressurizing unit to abut against the bushing unit of the plunger pump assembly; Step S242, when the pressurizing unit abuts against the bushing unit, control the pressurizing unit to continue to move a set distance in the direction close to the bushing unit at a set speed; Step S243, after the pressurizing unit moves a set distance in the direction close to the bushing unit and maintains for a set time, obtain the maximum force borne by the bushing unit as the test removal force data Y2.

9. A method for correcting the removal force of a cylinder bushing according to claim 8, characterized in that The set speed in step S242 is 2 mm / min; the set distance is 20 mm; the set time in step S243 is 10 min.

10. A test system, the test system is applied to a method for correcting the removal force of a cylinder bushing according to any one of claims 1-8, characterized in that The test system includes: A plunger pump assembly, the plunger pump assembly includes a cylinder body unit and a bushing unit; the cylinder body unit includes a cylinder body and a boss groove; a cavity with one end open is formed in the cylinder body; a boss groove is provided on the inner side wall of the cylinder body; the bushing unit includes a bushing ring and a boss ring; the two bushing rings are respectively fixedly connected to both ends of the boss ring; the outer peripheral side of the bushing ring is in interference fit with the inner peripheral wall of the cylinder body; The boss ring includes 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 the end close to the second ring portion to the other end; the cross-sectional area of the third ring portion gradually decreases from the end close to the second ring portion to the other end; The plunger pump assembly further 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 from the 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 bottom of the boss groove, and the outer peripheral walls of the first ring portion and the third ring portion respectively abut against the peripheral side walls of the boss groove; A test assembly, the test assembly includes a test bench and a pressurizing unit; one end of the pressurizing unit is detachably connected to the test bench; A simulation assembly, the simulation assembly is used for performing simulation operations on the plunger pump assembly and obtaining simulation ejection force data; The test system further includes an ejection test state; the ejection test state includes the test bench positioning and fixing the cylinder body, and the pressurizing unit moving in a direction close to the bushing ring.

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