Opposite-pulling loading type heavy-load lead screw pair bidirectional service life test bench with rigidity and friction torque performance detection function

Abstract

The invention discloses an opposite-pull loading type heavy-load lead screw pair bidirectional service life test bench with rigidity and friction torque performance detection, which comprises a lathe bed part, a workbench part, a driving part, a loading part and a rigidity test assembly, and is characterized in that the driving part is arranged at one end of the lathe bed part; the loading part is arranged at the other end, opposite to the driving part, of the lathe bed part; the workbench component is arranged on the lathe bed component and comprises two hollow optical shafts, a driving workbench, a loading workbench, two workbench base plates, a plurality of expansion sleeves and two friction torque testing assemblies, and the two hollow optical shafts are parallel to each other; one ends of the two hollow optical shafts penetrate through the two first through holes in the driving workbench correspondingly. Therefore, the accelerated life test can be performed on the two lead screw pairs at the same time, and the problems of insufficient loading capability, low test efficiency and single test module of the existing related equipment can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical device accelerated life test, and particularly relates to a double-direction life test platform of a heavy-load screw pair with rigidity and friction torque performance detection. BACKGROUND

[0002] A ball screw is an indispensable transmission element in the field of precision machinery, which is composed of a screw shaft, a nut and balls. Its main function is to convert rotary motion and linear motion, and it has the advantages of high positioning accuracy, small friction coefficient and long service life. Ball screws have various structural forms, such as internal circulation ball screws, external circulation ball screws and end cover ball screws. Different types of ball screws are suitable for different load sizes and speed requirements.

[0003] In recent years, with the rapid development of China's intelligent manufacturing industry, ball screws have been more widely used in industrial robots, semiconductor equipment, precision measuring instruments and other fields with high requirements for motion accuracy and stability. Whether the product quality can meet the strict standards of actual application scenarios requires special performance testing experiments, which obviously poses a more severe challenge to the design and application of ball screw-related test devices.

[0004] At present, there is a lack of ball screw life test platforms for heavy-load application scenarios in China. Not only is the high-load capacity lacking, but also the key indicators reflecting the life degradation state such as rigidity and friction torque cannot be monitored in situ. Therefore, how to design a test platform that can not only provide heavy ball screw load requirements, but also test key performance indicators of ball screws in situ, has become an urgent technical problem in the field. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0006] To this end, one purpose of the present application is to provide a double-direction life test platform of a heavy-load screw pair with rigidity and friction torque performance detection, which can simultaneously test the accelerated life and test of two screw pairs, and effectively solve the problems of insufficient loading capacity, low testing efficiency and single testing module of the current related equipment.

[0007] To achieve the above object, the first aspect of the present application provides a double-direction life test bench for heavy load screw pair with stiffness and friction torque performance detection, comprising a bed body component, a workbench component, a driving component, a loading component and a stiffness test assembly, wherein the driving component is arranged at one end of the bed body component; the loading component is arranged at the other end of the bed body component opposite to the driving component; the workbench component is arranged on the bed body component, and the workbench component comprises two hollow light shafts, a driving workbench, a loading workbench, two workbench backing plates, a plurality of expansion sleeves and two friction torque test assemblies, wherein the two hollow light shafts are parallel to each other; one end of each of the two hollow light shafts penetrates through two first through holes on the driving workbench, and the other end of each of the two hollow light shafts penetrates through two second through holes on the loading workbench; the plurality of expansion sleeves are arranged inside the first through holes and the second through holes respectively; the workbench backing plates are arranged at the bottom of the driving workbench and the bottom of the loading workbench respectively; the two friction torque test assemblies are arranged on the driving component and the loading component respectively; and the stiffness test assembly is detachably arranged on the driving component or the loading component.

[0008] The double-direction life test bench for heavy load screw pair with stiffness and friction torque performance detection can simultaneously perform accelerated life and test on two screw pairs, and can effectively solve the problems of insufficient loading capacity, low test efficiency and single test module of the related equipment.

[0009] In addition, the double-direction life test bench for heavy load screw pair with stiffness and friction torque performance detection can have the following additional technical features:

[0010] In an embodiment of the present application, the bed body component comprises a bed body, two linear guide pairs, a plurality of slider backing plates and two front frame backing plates, wherein the two linear guide pairs are arranged on the bed body in parallel to each other; the plurality of slider backing plates are arranged on the linear guide pairs in pairs; and the two front frame backing plates are arranged at two ends of the bed body respectively.

[0011] In an embodiment of the present application, the driving component comprises a first tailstock assembly, a first test screw rod pair, a first coupling, a first motor and a first headstock assembly, wherein the first tailstock assembly is slidably arranged on the lathe bed body and locked by a T-shaped nut; the first headstock assembly is arranged on the front rest base plate at one end; the first motor is arranged on one side of the first headstock assembly; the first coupling is arranged between the output shaft of the first motor and one end of the first test screw rod pair; the other end of the first test screw rod pair is connected with the first tailstock assembly; and the friction torque test assembly is arranged on the first test screw rod pair.

[0012] In an embodiment of the present application, the loading component comprises a second tailstock assembly, a second test screw rod pair, a second coupling, a second headstock assembly and a second motor, wherein the second tailstock assembly is slidably arranged on the lathe bed body and locked by a T-shaped nut; the second headstock assembly is arranged on the front rest base plate at the other end; the second motor is arranged on one side of the second headstock assembly; the second coupling is arranged between the output shaft of the second motor and one end of the second test screw rod pair; the other end of the second test screw rod pair is connected with the second tailstock assembly; and the friction torque test assembly is arranged on the second test screw rod pair.

[0013] In an embodiment of the present application, the friction torque test assembly comprises a torque sensor and a tension and compression force sensor, wherein the tension and compression force sensor and the torque sensor are connected.

[0014] In an embodiment of the present application, the stiffness test assembly comprises an encoder component, a magnetic base and a grating micrometer, wherein the encoder component is arranged on the first tailstock assembly; the magnetic base is arranged on the first test screw rod pair, and the magnetic base is between the driving workbench and the first headstock assembly; and the grating micrometer is arranged on the magnetic base.

[0015] In an embodiment of the present application, the encoder component comprises an encoder tool, an encoder expansion sleeve, an encoder expansion sleeve shaft and an encoder body, wherein the encoder tool is arranged on the encoder body; the encoder expansion sleeve is arranged inside the encoder body, and the encoder expansion sleeve shaft is arranged inside the encoder expansion sleeve.

[0016] Compared with the prior art, the present application at least has the following beneficial effects:

[0017] 1. The device adopts a symmetrical structure design, the driving component and the loading component are basically composed of the same structure and are symmetrically arranged at both ends of the lathe bed, the acceleration life test of two screw rod pairs can be simultaneously performed, and the problem of insufficient loading existing in other test benches in the same field is solved;

[0018] 2、The device takes into account different sizes of test screw pairs, and different tooling can be designed and used according to the model and test requirements of the screw pair;

[0019] 3、The device designs multiple measurement components, solves the single test module of the existing test bench, eliminates the tedious steps of frequently disassembling the screw during screw precision retention test, greatly reduces the labor cost, and speeds up the experiment progress.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 It is an overall structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0023] Figure 2 It is a bed structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0024] Figure 3 It is a workbench structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0025] Figure 4 It is a drive component structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0026] Figure 5 It is a loading component structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0027] Figure 6 It is a friction torque test component structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0028] Figure 7 It is a stiffness test component structure schematic diagram of a bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection of the present application;

[0029] Figure 8 Structure diagram of area A of a bidirectional life test bench for heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to the present application;

[0030] Figure 9 Structure diagram of encoder component of a bidirectional life test bench for heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to the present application;

[0031] Figure 10 Structure diagram of groove assembly of a bidirectional life test bench for heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to the present application;

[0032] Figure 11 Structure diagram of a bidirectional life test bench for heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to the present application;

[0033] Figure 12 Structure diagram of a bidirectional life test bench for heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to the present application.

[0034] As shown in the figure:

[0035] 1, bed body component; 1.1, bed body main body; 1.2, linear guide pair; 1.3, sliding block pad; 1.4, front frame pad;

[0036] 2, workbench component; 2.1, hollow light shaft; 2.2, driving workbench; 2.3, loading workbench; 2.4, workbench pad; 2.5, expansion sleeve; 2.6, friction torque test assembly; 2.6.1, torque sensor; 2.6.2, tension and pressure sensor;

[0037] 3, driving component; 3.1, first tail frame assembly; 3.2, first test screw pair; 3.3, first coupling; 3.4, first motor; 3.5, first head frame assembly;

[0038] 4, loading component; 4.1, second tail frame assembly; 4.2, second test screw pair; 4.3, second coupling; 4.4, second head frame assembly; 4.5, second motor;

[0039] 5, groove assembly; 5.1, linear guide installation groove; 5.2, T-shaped groove; 5.3, V-shaped sliding rail groove;

[0040] 6, rigidity test assembly; 6.1, encoder component; 6.1.1, encoder tooling; 6.1.2, encoder expansion sleeve; 6.1.3, encoder expansion sleeve shaft; 6.1.4, encoder body;

[0041] 6.2, magnetic base; 6.3, grating micrometer; 6.4, screw pair nut flange. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0043] A bidirectional life test bench of a heavy load screw pair with tensile loading and rigidity and friction torque performance detection is described below in detail according to an embodiment of the present application.

[0044] As shown in Figure 1 , Figure 11 and Figure 12 , a bidirectional life test bench of a heavy load screw pair with tensile loading and rigidity and friction torque performance detection according to an embodiment of the present application can include a bedstock component 1, a workbench component 2, a driving component 3, a loading component 4, and a rigidity test assembly 6.

[0045] The driving component 3 is arranged at one end of the bedstock component 1, and the loading component 4 is arranged at the other end of the bedstock component 1 opposite the driving component 3.

[0046] It should be noted that the driving component 3 and the loading component 4 are of the same structure and symmetrically arranged at both ends of the bedstock, and can simultaneously perform accelerated life tests on two test screw pairs (hereinafter first test screw pair 3.2 and second test screw pair 4.2).

[0047] The driving component 3 is used to provide driving force for the screw, and the loading component 4 is used to provide resistance to the screw.

[0048] Referring to Figure 3 , the workbench component 2 is arranged on the bedstock component 1, and the workbench component 2 can include two hollow light shafts 2.1, a driving workbench 2.2, a loading workbench 2.3, two workbench backing plates 2.4, a plurality of expansion sleeves 2.5, and two friction torque test assemblies 2.6.

[0049] The two hollow light shafts 2.1 are parallel to each other, one end of the two hollow light shafts 2.1 respectively passes through two first through holes on the driving workbench 2.2, and the other end of the two hollow light shafts 2.1 respectively passes through two second through holes on the loading workbench 2.3.

[0050] Further, the driving workbench 2.2 and the loading workbench 2.3 are connected by the two parallel hollow light shafts 2.1, and the distance between the driving workbench 2.2 and the loading workbench 2.3 is adjustable to meet the test of screw of different lengths.

[0051] A plurality of expansion sleeves 2.5 are arranged in the first through hole and the second through hole respectively.

[0052] It should be noted that the expansion sleeve 2.5 can be used to adjust the relative position of the two workbenches. When the position needs to be adjusted, the expansion sleeve 2.5 is loosened, and after the adjustment is completed, it is locked and fixed. The specific structure of the expansion sleeve 2.5 belongs to the common knowledge in the art, and will not be described here.

[0053] The workbench backing plate 2.4 is arranged at the bottom of the driving workbench 2.2 and the bottom of the loading workbench 2.3 respectively.

[0054] Two friction torque test assemblies 2.6 are arranged on the driving component 3 and the loading component 4 respectively.

[0055] It should be noted that the friction torque test assembly 2.6 can be used to test the friction torque of the test screw pair.

[0056] The rigidity test assembly 6 is detachably arranged on the driving component 3 or the loading component 4. It should be noted that the rigidity test assembly 6 is only used to measure the static rigidity of the test screw, and when the heavy load screw pair life test is carried out, the rigidity test assembly needs to be removed from the driving component 3 or the loading component 4.

[0057] It should be noted that when detecting various data of the test screw pair, the relevant staff can use external vibration and / or temperature measuring equipment to measure the corresponding characteristic data of the test screw.

[0058] For example, the temperature test equipment can measure the temperature rise data and temperature displacement data of the test screw pair under the required conditions, and the vibration equipment can measure the vibration curve of the test screw pair under the required conditions, so as to reflect the performance change of the test screw pair.

[0059] Among them, the external vibration equipment includes two sensors, one three-axis sensor and one single-axis sensor, the three-axis sensor is placed on the surface of the nut flange to measure the vibration of the screw in three directions, and the single-axis sensor is placed on the corresponding headstock assembly of the test screw pair to measure the one-way vibration of the test bench; the temperature measurement can use a magnetic temperature sensor, which is attached to the surface of the nut to monitor the temperature change in real time during the life running-in.

[0060] In an embodiment of the present application, as shown in Figure 2 The bed component 1 can include a bed body 1.1, two linear guide rail pairs 1.2, a plurality of slider backing plates 1.3, and two front frame backing plates 1.4.

[0061] Two linear guide pairs 1.2 are arranged on the bed body 1.1 in parallel to each other, and a plurality of slider pads 1.3 are arranged on the linear guide pairs 1.2 in pairs, and two front frame pads 1.4 are arranged at two ends of the bed body 1.1 respectively.

[0062] It should be noted that the bed body part 1 is used to mount and fix the workbench part 2, the driving part 3 and the loading part 4, and guide and limit the linear movement of the driving part 3 and the loading part 4. The linear guide pair 1.2 is used to mount the workbench part 2.

[0063] The slider pad 1.3 and the workbench pad 2.4 are connected to each other.

[0064] Further, as shown in Figure 5 and Figure 10 The upper surface of the bed body part 1 is provided with a groove assembly 5, which includes a V-shaped sliding rail groove 5.3, a T-shaped groove 5.2 and a linear guide rail mounting groove 5.1.

[0065] The V-shaped sliding rail groove 5.3 is one, which is used to provide sliding guide for the first tail frame assembly 3.1 and the second tail frame assembly 4.1; the T-shaped groove 5.2 is two, which is arranged on both sides of the V-shaped sliding rail groove 5.3, and the built-in T-shaped nut is used to fix the first tail frame assembly 3.1 and the second tail frame assembly 4.1; the linear guide rail mounting groove 5.1 is four, which is symmetrically arranged on both sides of the bed body part 1, and is used to mount the linear guide pair 1.2.

[0066] In an embodiment of the present application, as shown in Figure 4 The driving part 3 can include a first tail frame assembly 3.1, a first test lead screw pair 3.2, a first coupling 3.3, a first motor 3.4 and a first head frame assembly 3.5.

[0067] It should be noted that the driving part 3 is used to support and drive the first test lead screw pair 3.2 to rotate.

[0068] The first tail frame assembly 3.1 is slidably arranged on the bed body 1.1 and locked by the T-shaped nut.

[0069] The first head frame assembly 3.5 is arranged on the front frame pad 1.4 at one end, the first motor 3.4 is arranged on one side of the first head frame assembly 3.5, the first coupling 3.3 is arranged between the output shaft of the first motor 3.4 and one end of the first test lead screw pair 3.2, and the other end of the first test lead screw pair 3.2 is connected with the first tail frame assembly 3.1.

[0070] The friction torque test assembly 2.6 is arranged on the first test lead screw pair 3.2.

[0071] In an embodiment of the present application, as shown in Figure 5As shown, the loading component 4 may include a second tailstock assembly 4.1, a second test lead screw pair 4.2, a second coupling 4.3, a second headstock assembly 4.4, and a second motor 4.5.

[0072] It should be noted that the loading component 4 is used to support and drive the rotation of the second test lead screw pair 4.2.

[0073] The second tailstock assembly 4.1 is slidably mounted on the bed body 1.1 and locked in place by a T-nut.

[0074] The second headstock assembly 4.4 is mounted on the front frame pad 1.4 at the other end, and the second motor 4.5 is mounted on one side of the second headstock assembly 4.4; the second coupling 4.3 is mounted between the output shaft of the second motor 4.5 and one end of the second test screw pair 4.2, and the other end of the second test screw pair 4.2 is connected to the second tailstock assembly 4.1.

[0075] Friction torque test assembly 2.6 is set on the second test lead screw pair 4.2.

[0076] It should be noted that the reference Figure 4 , Figure 5 and Figure 7 In the above embodiment, both the first test screw pair 3.2 and the second test screw pair 4.2 are threadedly connected to the screw pair nut flange 6.4. The drive worktable 2.2 and the loading worktable 2.3 are respectively installed on the screw pair nut flange. Therefore, when the test screw pair rotates, the corresponding worktable can reciprocate together with the screw pair nut flange 6.4.

[0077] Among them, the first test lead screw pair 3.2 and the second test lead screw pair 4.2 are lead screw pairs of the same type. The first test lead screw pair 3.2 is used to transmit the driving force of the first motor 3.4 to drive its lead screw to rotate, thereby causing the nut connected to the lead screw to drive the worktable component 2 to move. The second test lead screw pair 4.2 is used to transmit the loading force of the second motor 4.5. The second test lead screw pair 4.2 conducts life test by transmitting load through torque. Both lead screw pairs are used as the lead screw pairs under test, providing working load to each other, so that the test device can simultaneously conduct accelerated wear test of two lead screw pairs of the same type.

[0078] In one embodiment of this application, such as Figure 6 As shown, the friction torque testing assembly 2.6 may include a torque sensor 2.6.1 and a tension / compression sensor 2.6.2.

[0079] Among them, the tension / compression sensor 2.6.2 and the torque sensor 2.6.1 are connected.

[0080] It needs to be explained that the test bench workbench is moved by the motor, so as to monitor the dynamic friction torque of the first test screw rod pair 3.2 and the second test screw rod pair 4.2.

[0081] Specifically, when the relevant staff needs to carry out the heavy load screw rod pair life test, first, two screw rod pairs of the same type are selected as the first test screw rod pair 3.2 and the second test screw rod pair 4.2, then the workbench components 2, the first test screw rod pair 3.2 and the second test screw rod pair 4.2 are installed in sequence, the first test screw rod pair 3.2 passes through the center hole of the driving workbench 2.2, the second test screw rod pair 4.2 passes through the center hole of the loading workbench 2.3, and the nut on each test screw rod pair is connected and locked with the friction torque test assembly 2.6 of the workbench.

[0082] Then, the first motor 3.4 and the second motor 4.5 are started, the first motor 3.4 drives the first test screw rod pair 3.2 to rotate, so that the screw rod nut drives the workbench component 2 to move linearly on the bed component 1, the second motor 4.5 applies the torque corresponding to the required load force, and the second test screw rod pair 4.2 carries out the life test by torque transmission load, the structure of the life test bench is symmetrical, and the load is provided for each other during the running-in process.

[0083] The two hollow light shafts 2.1 are connected by the expansion sleeve 2.5 to connect the loading component 4 workbench and the driving component 3 workbench, so that the whole workbench component 2 realizes reciprocating motion on the bed component 1, and the required test parameters are set, including test load, test speed and the like, to ensure that the test process is carried out according to the preset load and speed.

[0084] Then, the external vibration and temperature measuring equipment can measure the characteristic data of the measured screw rod pair, and the state change of the screw rod pair can be preliminarily inferred by analyzing the data, and the heavy load life test is completed. If the specific wear of the screw rod pair is known, the test sample can be removed and the electronic microscope equipment is used to observe the micro surface of the screw rod in more detail.

[0085] The device of the application can consider different sizes and types of ball screw, planetary roller screw and trapezoidal screw, etc., different tooling can be designed and used according to the type and test requirement of the screw rod pair, the maximum allowable nominal diameter of the test screw rod pair can reach 120mm; the driving workbench 2.2 and the loading workbench 2.3 form a relative position variable type double workbench, the relative position of the two workbenches can be freely adjusted or fixed according to the requirement, which is convenient for the installation of the screw rod pair and can adapt to the test of screw rod of different lengths, the device has higher compatibility and more flexible use mode.

[0086] It should be noted that the first motor 3.4 and the second motor 4.5 described in the above embodiment are large-power permanent magnet synchronous servo motors, which have good energy-saving effect, simple control, high and stable torsion output, can provide maximum loading capacity for the test device under certain volume limitation, meet the high load working condition requirement of the heavy-duty screw pair, and match the high-precision servo control system, so that the test device can have high-precision speed control ability and constant large-torque output.

[0087] Meanwhile, by controlling the two motors, one-way, two-way loading or variable load loading of the screw can be realized, and various different working conditions can be simulated; the two motors are directly connected with the screw pair for driving and loading, the transmission chain is shortened, the efficiency loss is reduced, the structure is simple, the response is fast, and the efficiency is high.

[0088] In an embodiment of the present application, as shown in Figure 7 and Figure 8 , the stiffness test assembly 6 can include an encoder component 6.1, a magnetic base 6.2 and a grating micrometer 6.3.

[0089] The encoder component 6.1 is arranged on the first tailstock assembly 3.1, the magnetic base 6.2 is arranged on the first test screw pair 3.2, and the magnetic base 6.2 is between the driving workbench 2.2 and the first headstock assembly 3.5.

[0090] The grating micrometer 6.3 is arranged on the magnetic base 6.2.

[0091] It should be noted that the measuring head of the grating micrometer 6.3 is in contact with the surface of the nut flange of the first test screw pair 3.2.

[0092] Specifically, when the static stiffness of the screw needs to be measured, the loading component 4 provides a loading force, the encoder component 6.1 eliminates the influence of the torsional deformation of the screw when loaded and unloaded on the stiffness measurement of the screw, and the grating micrometer 6.3 measures the axial displacement of the first test screw pair 3.2 when loaded and unloaded, obtains the relationship between the displacement and the loading force, and calculates the static stiffness of the screw.

[0093] Further, in order to further improve the accuracy of the static stiffness test of the screw pair, in an embodiment of the present application, as shown in Figure 9 , the encoder component 6.1 can include an encoder tool 6.1.1, an encoder expansion sleeve 6.1.2, an encoder expansion sleeve shaft 6.1.3 and an encoder body 6.1.4.

[0094] The encoder tool 6.1.1 is arranged on the encoder body 6.1.4, the encoder expansion sleeve 6.1.2 is arranged inside the encoder body 6.1.4, and the encoder expansion sleeve shaft 6.1.3 is arranged inside the encoder expansion sleeve 6.1.2.

[0095] It should be noted that the encoder expansion shaft 6.1.3 is rotated together with the first test screw pair 3.2 in the encoder expansion sleeve 6.1.2, so that the encoder expansion sleeve 6.1.2 cooperates with the encoder body 6.1.4, and the encoder tool 6.1.1 is installed on the first tailstock assembly 3.1. The torque of the torsional deformation of the screw due to compression or tension can be measured during stiffness testing. The test system eliminates the influence of the torsional deformation of the screw during loading and unloading on the stiffness measurement of the screw through the encoder body 6.1.4, so as to improve the accuracy of the stiffness test.

[0096] In summary, the bidirectional life test bench for heavy load screw pairs with stiffness and friction torque performance detection provided by the embodiment of the application has the following beneficial effects:

[0097] (1) The device adopts a symmetrical structure design, and the driving part 3 and the loading part 4 are basically composed of the same structure and are symmetrically arranged at both ends of the bed part 1. The acceleration life test of two screw pairs can be simultaneously performed. The two motors and the two screws are on the same central axis and provide working load for each other, solving the problem of insufficient loading of other test benches in the same field. The overall bed part 1 structure is optimized for large load testing, and the overall test bench can apply a maximum load of 30 tons to the test screw pair.

[0098] (2) The device can accommodate test screw pairs of different sizes and models. Different tooling can be designed and used according to the model and test requirements of the screw pair. The relative position of the driving workbench 2.2 and the loading workbench 2.3 can be freely adjusted or fixed according to needs, which facilitates the installation of the screw pair and adapts to screw tests of different lengths, and the device has higher compatibility and more flexible use.

[0099] (3) The device uses a stiffness measurement assembly composed of an encoder part 6.1, an encoder expansion sleeve 6.1.2, an encoder tool 6.1.1, and an encoder expansion sleeve shaft 6.1.3. The stiffness test assembly 6 is installed in the tailstock assembly of the driving part 3. The grating micrometer 6.3 is fixedly connected to the magnetic base. During stiffness measurement, the loading part 4 provides a load, the encoder part 6.1 eliminates the influence of the torsional deformation of the screw during loading and unloading on the stiffness measurement of the screw, and the grating micrometer 6.3 measures the axial displacement of the screw during loading and unloading to obtain the relationship between displacement and load and calculate the static stiffness of the screw.

[0100] (4) The device uses a friction torque measurement assembly composed of a torque sensor 2.6.1 and a tension and compression force sensor 2.6.2, forming a tension and compression and torsion combined sensor, which is installed in the loading workbench 2.3 and the driving workbench 2.2 of the workbench part 2. The test bench workbench is driven by the motor to monitor the dynamic friction torque of the test screw pair.

[0101] (5) The device uses the rigidity measuring assembly and the friction torque measuring assembly, solves the single test module of the existing test bench, eliminates the cumbersome steps of frequently disassembling the screw rod for the screw rod precision maintenance test, greatly reduces the labor cost, and accelerates the experimental progress.

[0102] In the description of the present specification, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0103] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0104] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and deformations to the above embodiments within the scope of the present application.

Claims

1. A bidirectional life test bench with rigidity and friction torque performance detection for a push-pull heavy load screw pair, characterized in that, The machine comprises a bed component, a worktable component, a driving component, a loading component and a rigidity testing assembly, wherein, the driving component is arranged at one end of the bed component; the loading component is arranged at the other end of the bed component opposite to the driving component; the worktable component is arranged on the bed component, and comprises two hollow light shafts, a driving worktable, a loading worktable, two worktable backing plates, a plurality of expansion sleeves and two friction torque testing assemblies, wherein, the two hollow light shafts are parallel to each other, and one end of each of the two hollow light shafts penetrates through a first through hole on the driving worktable, and the other end of each of the two hollow light shafts penetrates through a second through hole on the loading worktable; the plurality of expansion sleeves are arranged inside the first through holes and the second through holes respectively; the worktable backing plates are arranged at the bottom of the driving worktable and the bottom of the loading worktable respectively; the two friction torque testing assemblies are arranged on the driving component and the loading component respectively; the rigidity testing assembly is detachably arranged on the driving component or the loading component.

2. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 1, characterized in that, The bed component comprises a bed main body, two linear guide pairs, a plurality of slider backing plates and two front frame backing plates, wherein, the two linear guide pairs are arranged on the bed main body in parallel to each other; the plurality of slider backing plates are arranged on the linear guide pairs in pairs; the two front frame backing plates are arranged at two ends of the bed main body respectively.

3. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 2, characterized in that, The driving component comprises a first tailstock assembly, a first test lead screw pair, a first coupling, a first motor and a first headstock assembly, wherein, the first tailstock assembly is slidably arranged on the bed main body and locked by a T-shaped nut; the first headstock assembly is arranged on the front frame backing plate at one end; the first motor is arranged on one side of the first headstock assembly; the first coupling is arranged between the output shaft of the first motor and one end of the first test lead screw pair; the other end of the first test lead screw pair is connected with the first tailstock assembly; the friction torque testing assembly is arranged on the first test lead screw pair.

4. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 2, characterized in that, The loading component comprises a second tailstock assembly, a second test lead screw pair, a second coupling, a second headstock assembly and a second motor, wherein, the second tailstock assembly is slidably arranged on the bed main body and locked by a T-shaped nut; the second headstock assembly is arranged on the front frame backing plate at the other end; the second motor is arranged on one side of the second headstock assembly; the second coupling is arranged between the output shaft of the second motor and one end of the second test lead screw pair; the other end of the second test lead screw pair is connected with the second tailstock assembly; the friction torque testing assembly is arranged on the second test lead screw pair.

5. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 1, characterized in that, The friction torque testing assembly comprises a torque sensor and a tension and pressure sensor, wherein, the tension and pressure sensor is connected with the torque sensor.

6. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 3, characterized in that, The rigidity testing assembly comprises an encoder component, a magnetic base and a grating micrometer, wherein, the encoder component is arranged on the first tailstock assembly; The magnetic base is arranged on the first test screw pair, and is arranged between the driving workbench and the first headstock assembly; The grating micrometer is arranged on the magnetic base.

7. The bidirectional life test bench with tension and friction torque performance detection for the heavy load screw pair according to claim 6, characterized in that, The encoder component comprises an encoder tool, an encoder expansion sleeve, an encoder expansion sleeve shaft and an encoder body, wherein, The encoder tool is arranged on the encoder body; The encoder expansion sleeve is arranged inside the encoder body, and the encoder expansion sleeve shaft is arranged inside the encoder expansion sleeve.

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