Tool and method for testing efficiency of lead screw

Abstract

The invention relates to the technical field of lead screw detection, in particular to a tool and method for testing the efficiency of a lead screw, and the tool comprises a supporting seat, the lead screw and a nut. The screw rod can rotate circumferentially at the supporting seat, and the nut can move in the axial direction of the screw rod in the rotating process of the screw rod; a pressure sensor and a flexible device are further arranged at the supporting seat; the pressure sensor is arranged in the axial direction of the screw rod, and the flexible device is arranged between the pressure sensor and the nut; the lead screw rotates to drive the nut to move towards the pressure sensor, and the pressure sensor is extruded through the flexible device. The tool is adopted in the method. The tool is smaller in overall size, does not have excessive parts such as a speed reducer, a coupler and a spring, can reduce the power loss in the torque transmission process, and is higher in accuracy of the screw rod efficiency test. Large friction force generated by the nut and a mechanism in direct contact with the nut is weakened or counteracted through deformation of the flexible device, and the accuracy of lead screw efficiency testing is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screw rod detection, and in particular to a tool and method for testing screw rod efficiency. Background Art

[0002] As a transmission mechanism, the screw consumes a certain amount of power when converting torque into thrust. In the actual use of the screw, it is necessary to effectively test the efficiency of the screw to verify the rationality of the screw in the product application process.

[0003] At present, the existing tooling for testing the efficiency of screw rods is relatively large in size and has high requirements on the site. In addition, it integrates motors, reducers, couplings, springs, etc. Too many parts on the test bench will also cause power loss during the torque transmission process, affecting the accuracy of the test of screw rod efficiency.

[0004] In addition, the thrust of the nut directly acts on the pressure sensor, and the reaction force of the pressure sensor will cause a large friction between the nut and the rotation limiting mechanism, further affecting the accuracy of the measured screw efficiency. Summary of the invention

[0005] In view of the above problems existing in the prior art, the present invention provides a tool and method for testing the efficiency of a screw rod.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] In a first aspect, a tool for testing the efficiency of a screw rod is provided, which comprises a support seat, a screw rod disposed at the support seat, and a nut sleeved on the screw rod; the screw rod can rotate circumferentially at the support seat, and the nut can move along the axial direction of the screw rod during the rotation of the screw rod;

[0008] The support seat is also provided with a pressure sensor and a flexible device; the pressure sensor is arranged in the axial direction of the screw rod, and the flexible device is arranged between the pressure sensor and the screw nut;

[0009] The rotation of the screw rod can drive the nut to move toward the pressure sensor and squeeze the pressure sensor through the flexible device.

[0010] Preferably, a base for mounting the pressure sensor and a connecting block connecting the base and the support base are provided on one side of the support base;

[0011] A connecting through hole is arranged in the connecting block, and the flexible device is arranged in the connecting through hole.

[0012] Preferably, the flexible device comprises an elastic member movable along the axial direction of the connecting through hole.

[0013] Preferably, the elastic member includes a first seal and a second seal, and a liquid medium is filled between the first seal and the second seal, and the first seal and the second seal can seal the liquid medium in the connecting through hole.

[0014] Preferably, the support seat is provided with a shell, and the shell is provided with a loading through hole; the input end of the screw rod is rotatably arranged in the loading through hole through a bearing.

[0015] Preferably, an anti-rotation sleeve capable of cooperating with the nut is provided on the housing and / or the support seat, and when the nut moves on the screw rod, the anti-rotation sleeve can limit the circumferential rotation of the nut.

[0016] Preferably, a push rod is provided between the flexible device and the nut, and when the screw rod rotates, the nut squeezes the flexible device through the push rod.

[0017] In a second aspect, a method for testing the efficiency of a screw rod is provided, using the above-mentioned tooling, comprising:

[0018] Verify the loss of the flexible device during thrust transmission;

[0019] Applying torque to the screw rod so that the screw rod drives the nut to squeeze the pressure sensor through the flexible device;

[0020] The transmission efficiency of the screw shaft is calculated based on the loss check, the detection value of the pressure sensor, the lead of the screw shaft, and the torque.

[0021] Preferably, when the loss check of the flexible device during the thrust transmission process is performed, a pressure detector is arranged on one side of the flexible device, and a thrust is applied to the flexible device so that the flexible device squeezes the pressure detector;

[0022] A thrust loss coefficient is calculated based on the thrust and the detection value of the pressure detector.

[0023] Preferably, the torque is applied to the screw rod after the flexible device is assembled to the tooling.

[0024] The present invention has at least the following beneficial effects:

[0025] 1. Compared with the existing screw efficiency test bench, the overall size of the tooling of the present application is smaller, easy to use, and does not have too many parts such as reducers, couplings and springs, so that the power loss in the torque transmission process can be reduced accordingly, making the accuracy of the screw efficiency test higher.

[0026] 2. When the nut is in direct contact with the pressure sensor to transmit the thrust, the pressure sensor will form a certain reaction force on the nut. The reaction force will cause the mechanism with which the nut is in direct contact to generate a large friction force, such as a large friction force between the nut and the screw, thereby affecting the accuracy of the screw efficiency test. The present application can better avoid the above-mentioned problem by setting a flexible device, so that the thrust of the nut indirectly acts on the flexible device and is then transmitted to the pressure sensor. Since the flexible device has better elastic properties, the reaction force can be weakened or offset by the deformation of the flexible device itself, thereby improving the accuracy of the screw efficiency test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A cross-sectional view of a tool for testing the efficiency of a screw rod in some embodiments of the present application is shown;

[0028] Figure 2 A first flow chart of a method for testing screw efficiency in some embodiments of the present application is shown;

[0029] Figure 3 A second flow chart of the method for testing screw efficiency in some embodiments of the present application is shown.

[0030] The parts indicated by the numbers in the accompanying drawings are as follows:

[0031] 100, support seat; 101, movable through hole; 110, housing; 111, loading through hole; 112, bearing; 113, anti-rotation sleeve; 200, screw rod; 201, square groove; 210, nut; 300, pressure sensor; 400, elastic member; 410, first sealing member; 411, first movable block; 412, first sealing ring; 420, second sealing member; 421, second movable block; 422, second sealing ring; 430, liquid medium; 500, base; 510, recessed groove; 600, connecting block; 610, connecting through hole; 700, push rod; 710, accommodating chamber. DETAILED DESCRIPTION

[0032] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0033] First, as Figure 1As shown, in this embodiment, a tool for testing the efficiency of a screw rod is provided, which includes a support seat 100, a screw rod 200 and a nut 210, wherein the screw rod 200 is positioned and installed on the support seat 100, and the nut 210 is sleeved on the screw rod 200; when a certain torque is applied to the screw rod 200, the screw rod 200 can rotate in the circumferential direction, and the nut 210 on the screw rod 200 can be driven through the circumferential rotation of the screw rod 200, so that the nut 210 can move along the axial direction of the screw rod 200. Furthermore, a pressure sensor 300 and a flexible device are also provided on the support seat 100, wherein the pressure sensor 300 is arranged in the axial direction of the screw rod 200, so that when the screw rod 200 rotates, it can drive the nut 210 to move toward or away from the pressure sensor 300; the flexible device is arranged between the pressure sensor 300 and the nut 210, and when the screw rod 200 rotates and drives the nut 210 to move toward the pressure sensor 300, the thrust of the nut 210 can first act on the flexible device, and then be transmitted to the pressure sensor 300 through the flexible device, and then the efficiency of the screw rod 200 is calculated by obtaining the detection value of the pressure sensor 300.

[0034] It is worth mentioning that when the nut 210 directly contacts the pressure sensor 300 to realize the transmission of thrust, the pressure sensor 300 will form a certain reaction force on the nut 210. The reaction force will cause the nut 210 to generate a larger friction force on the mechanism directly contacting it, such as a larger friction force between the nut 210 and the screw rod 200, thereby affecting the accuracy of the efficiency test of the screw rod 200. The present embodiment can better avoid the above-mentioned problem through the setting of the above-mentioned flexible device, so that the thrust of the nut 210 indirectly acts on the flexible device, and then is transmitted to the pressure sensor 300. Since the flexible device has better elastic properties, the reaction force can be weakened or offset by the deformation of the flexible device itself, thereby improving the accuracy of the efficiency test of the screw rod 200.

[0035] It can be further understood that when the nut 210 is in direct contact with the pressure sensor 300 to achieve the transmission of thrust, due to the installation accuracy problem or the friction generated by direct contact, the nut 210 or the pressure sensor 300 will inevitably produce relative position shaking, which affects the final detection accuracy of the pressure sensor 300. The flexible device provided in this embodiment has a certain elastic property. The nut 210 indirectly squeezes the flexible device, and then transmits the thrust to the pressure sensor 300 through the flexible device. In this process, the friction between the nut 210 and the pressure sensor 300 can be avoided. At the same time, because the flexible device has elastic properties, the extrusion between the flexible device and the nut 210 and the pressure sensor 300 is relatively stable and more fitted. When the position of the nut 210 shakes slightly, the flexible device can automatically adapt by deforming itself to a certain extent to avoid friction on the contact surface between the flexible device and the nut 210. Similarly, when the position of the pressure sensor 300 shakes slightly, the flexible device can also automatically adapt by deforming itself to a certain extent to avoid friction on the contact surface between the flexible device and the pressure sensor 300. Furthermore, since the flexible device has the characteristics of elastic properties, the installation accuracy requirements of the flexible device are not high. Even if the installation of the flexible device is slightly misaligned or angularly offset, in the process of the nut 210 squeezing the flexible device and transmitting the thrust to the pressure sensor 300, the flexible device can eliminate the influence through its own deformation, thereby ensuring the accuracy of the efficiency test of the screw rod 200.

[0036] Furthermore, compared with the currently available test bench for the efficiency of the screw 200, the overall size of the tooling of this embodiment is smaller, and it is easy to use, and does not have too many parts such as reducers, couplings, and springs, so that the power loss in the torque transmission process can be reduced accordingly, making the accuracy of the screw 200 efficiency test higher.

[0037] In some embodiments, a base 500 is provided on one side of the support base 100, and the pressure sensor 300 is fixedly installed through the base 500. A connecting block 600 is also provided on one side of the support base 100, and the base 500 is fixedly installed on one side of the base 500 through the connecting block 600. A connecting through hole 610 penetrating the connecting block 600 is provided on the connecting block 600, and the axial direction of the connecting through hole 610 is consistent with the axial direction of the screw rod 200. When a torque is applied to the screw rod 200 so that the screw rod 200 rotates, the nut 210 can squeeze the pressure sensor 300 on the other side of the connecting through hole 610 through the connecting through hole 610. Furthermore, the above-mentioned flexible device is provided in the connecting through hole 610. When the screw rod 200 rotates to drive the nut 210 to move toward the pressure sensor 300, the nut 210 will first squeeze the flexible device in the connecting through hole 610, and then the flexible device squeezes the pressure sensor 300, thereby realizing the detection of the efficiency of the screw rod 200.

[0038] It can be understood that since the flexible device plays the role of indirectly transmitting the thrust of the nut 210, and since the flexible device has a certain elastic property, the flexible device is easily affected by the external environment. Whether it is a sudden touch from the outside or the influence of temperature and humidity, it may affect its transmission of thrust. Therefore, this embodiment provides a connecting block 600 with a connecting through hole 610, so that the flexible device is placed in the connecting through hole 610 to avoid external touch, thereby ensuring that the flexible device can maintain a stable state during the process of transmitting the thrust from the nut 210, thereby ensuring the accuracy of the efficiency test of the screw rod 200; further, a corresponding temperature adjustment or humidity adjustment device can be provided on the connecting block 600 to ensure the temperature or humidity in the connecting through hole 610, thereby improving the stability of the overall state of the flexible device.

[0039] In some embodiments, the connection block 600 and the support seat 100 are detachably connected, and can be specifically connected by bolts, snaps, etc., so as to facilitate the assembly, disassembly and maintenance of the overall tooling.

[0040] In some embodiments, the base 500 and the connecting block 600 are also detachably connected, and can be specifically connected by bolts, buckles, etc., so as to facilitate the assembly and disassembly and maintenance of the overall tooling. A recessed groove 510 is provided on the side of the base 500 facing the connecting block 600, and the recessed groove 510 is used to accommodate the pressure sensor 300. The pressure sensor 300 can be fixedly installed in the recessed groove 510 by bolts, buckles or bonding. It can be understood that after the base 500 is disassembled from the connecting block 600, the pressure sensor 300 can also be disassembled from the base 500, thereby facilitating the replacement or maintenance of the pressure sensor 300.

[0041] Furthermore, the width and / or length of the recessed groove 510 and the pressure sensor 300 are larger than the dimensions of the connecting through hole 610 in the corresponding directions, so that when the base 500 and the connecting block 600 are installed, the connecting block 600 at the opening of the connecting through hole 610 close to the base 500 can limit or press the pressure sensor 300, thereby improving the stability of the position of the pressure sensor 300 and preventing the pressure sensor 300 from shaking and generating friction that affects the detection of force.

[0042] In some embodiments, the flexible device includes an elastic member 400 , and the elastic member 400 can move along the axial direction of the connecting through hole 610 after being installed in the connecting through hole 610 .

[0043] When a certain torque is applied to the screw rod 200 to make the screw rod 200 rotate, the nut 210 moves toward the pressure sensor 300 along the axial direction of the screw rod 200. During this process, the nut 210 will first squeeze the elastic member 400 in the connecting through hole 610, and the elastic member 400 will produce a certain deformation in the direction of the pressure sensor 300 in the connecting through hole 610, thereby realizing the transmission of the thrust of the nut 210 to the pressure sensor 300. Further, in the process of the elastic member 400 being deformed, the elastic member 400 can also move in the connecting through hole 610 toward the direction of the pressure sensor 300, thereby relatively completely transmitting the thrust of the nut 210 to the pressure sensor 300, so as to accurately detect the thrust of the nut 210.

[0044] It should be noted that, in some preferred embodiments, the overall size of the elastic member 400 can be set equal to the size of the connecting through hole 610, so that the elastic member 400 can better fill the connecting through hole 610, and correspondingly, the stroke of the nut 210 moving to extrude the elastic member 400 can be reduced, so that the nut 210 can move a shorter stroke to extrude the elastic member 400 and then transmit the thrust to the pressure sensor 300, making the detection more efficient.

[0045] In some embodiments, the elastic member 400 includes a first seal 410, a second seal 420 and a liquid medium 430, wherein after the first seal 410 and the second seal 420 are installed in the connecting through hole 610, the first seal 410 is closer to the nut 210 than the second seal 420, and an enclosed space can be formed between the first seal 410, the second seal 420 and the connecting through hole 610, and the enclosed space, i.e., between the first seal 410 and the second seal 420, is filled with the liquid medium 430. When a certain torque is applied to the screw rod 200, the screw rod 200 rotates and drives the nut 210 to move toward the pressure sensor 300. During this process, the nut 210 first applies a thrust to the first seal 410, thereby pushing the first seal 410 to compress the liquid medium 430. When the liquid medium 430 is compressed as a whole, the force is transmitted to the second seal 420, and then the second seal 420 squeezes the pressure sensor 300, thereby realizing indirect transmission of the thrust to the nut 210.

[0046] It is worth mentioning that the nut 210 directly squeezes the first seal 410, and the second seal 420 directly squeezes the pressure sensor, and the force transmission between the first seal 410 and the second seal 420 is achieved through the liquid medium 430. The liquid medium 430 can directly avoid the contact between the first seal 410 and the second seal 420 in the process of transmitting the thrust, and thus can directly avoid the friction between the first seal 410 and the second seal 420, that is, the nut 210 will not generate friction in the process of pushing the liquid medium 430 through the first seal 410, and the liquid medium 430 will not generate friction in the process of squeezing the pressure sensor 300 through the second seal 420, thereby better avoiding the accuracy of the detection of the efficiency of the screw rod 200 due to the friction factor.

[0047] It can be understood that, through the setting of the above-mentioned liquid medium 430, on the one hand, the force transmission can be better realized through the compression of the liquid medium 430, and on the other hand, the first seal 410 and the second seal 420 can be isolated to avoid direct contact between the first seal 410 and the second seal 420, and avoid the generation of friction, thereby better improving the accuracy of the detection of the efficiency of the screw rod 200.

[0048] Since the connection block 600 is detachably connected to the support seat 100 and the base 500, the first seal 410 or the second seal 420 can be taken out from the connecting through hole 610, and the liquid medium 430 in the connecting through hole 610 can be replaced, for example, a liquid medium 430 of different density can be replaced. Furthermore, the liquid medium 430 can be replaced in a targeted manner according to different use environments. For example, if the temperature of the use environment is unstable, a liquid medium 430 that is less affected by temperature changes can be used, thereby ensuring the stability of the overall state of the liquid medium 430, and thus ensuring the accuracy of the detection of the efficiency of the screw 200.

[0049] In some embodiments, the first seal 410 includes a first movable block 411 and a first sealing ring 412, and the first sealing ring 412 is sleeved on the circumferential side wall of the first movable block 411. The second seal 420 includes a second movable block 421 and a second sealing ring 422, and the second sealing ring 422 is sleeved on the circumferential side wall of the second movable block 421. Specifically, the first sealing ring 412 can be installed on the first movable block 411 by bolting, bonding or clamping, and the second sealing ring 422 can also be installed on the second movable block 421 by bolting, bonding or clamping, so that when the first seal 410 and the second seal 420 are installed in the connecting through hole 610, the liquid medium 430 can be better sealed.

[0050] In some embodiments, a housing 110 is provided on the support seat 100, and a loading through hole 111 penetrating the housing 110 is provided on the housing 110. One end of the screw rod 200 for loading torque, i.e., the input end, is installed in the loading through hole 111 through a bearing 112. The bearing 112 is specifically a thrust bearing. When torque is applied to the input end of the screw rod 200, the screw rod 200 can rotate in the circumferential direction in the loading through hole 111 through the bearing 112, thereby realizing the driving of the nut 210 sleeved on the screw rod 200.

[0051] Furthermore, a movable through hole 101 penetrating the support seat 100 is provided on the support seat 100, and the screw rod 200 is located on the other side of the support seat 100 relative to the pressure sensor 300. The axial direction of the screw rod 200 is consistent with the axial direction of the movable through hole 101. When the screw rod 200 rotates, the nut 210 can squeeze the first sealing member 410 through the movable through hole 101.

[0052] It can be understood that the entire shell 110 and the screw rod 200 are both arranged on the other side of the support seat 100 relative to the pressure sensor 300, and the entire shell 110 is covered outside the screw rod 200, so that the screw rod 200 is isolated from the external environment, which can better avoid the external contact from affecting the stability of the state of the screw rod 200, and then the screw rod 200 can stably transmit torque, thereby improving the accuracy of the detection of the efficiency of the screw rod 200.

[0053] In some embodiments, an anti-rotation sleeve 113 is provided on the outer shell 110 and / or the support seat 100, and the anti-rotation sleeve 113 can cooperate with the nut 210. When torque is applied to the screw rod 200 to make the screw rod 200 rotate, the anti-rotation sleeve 113 can limit the circumferential rotation of the nut 210, so that the nut 210 can only reciprocate along the axial direction of the screw rod 200, so that the nut 210 can move toward the direction of the pressure sensor 300 and finally squeeze the pressure sensor 300 through the second seal 420.

[0054] Furthermore, the anti-rotation sleeve 113 is specifically arranged on the housing 110, and the anti-rotation sleeve 113 and the housing 110 are detachably connected, and can be specifically connected by bolts, buckles, etc. A guide groove (not shown in the figure) parallel to the axial direction of the screw rod 200 can be arranged on the anti-rotation sleeve 113, and a limit block (not shown in the figure) that can be inserted into the guide groove can be arranged on the nut 210. The limit block can reciprocate in the guide groove along the length direction of the guide groove. When the limit block is inserted into the guide groove, the circumferential limit of the nut 210 can be better achieved. When the screw rod 200 rotates, the nut 210 can move toward the pressure sensor 300 through the movement of the limit block in the guide groove.

[0055] It is understandable that the anti-rotation sleeve 113 can guide the movement of the nut 210 while limiting the nut 210 circumferentially, and can improve the stability of the movement of the nut 210 to a certain extent.

[0056] In some embodiments, the tooling in this embodiment further includes a push rod 700, which is inserted into the movable through hole 101, and one end of the push rod 700 away from the pressure sensor 300 is recessed inward to form a receiving chamber 710, and the push rod 700 is sleeved on the other end of the screw rod 200 through the receiving chamber 710. Further, one end of the push rod 700 away from the pressure sensor 300 is fixedly connected or abutted with the screw nut 210, and one end of the push rod 700 close to the pressure sensor 300 is abutted with the first movable block 411. Further, the push rod 700 and the screw nut 210 can be fixedly connected by bolts, clamping, etc., and this is not particularly limited.

[0057] When torque is applied to the input end of the screw rod 200 so that the screw rod 200 rotates through the bearing 112, the nut 210 will directly drive the push rod 700 to move toward the direction of the pressure sensor 300. Since the two ends of the push rod 700 are in direct contact with the nut 210 and the first movable block 411 respectively, when the screw rod 200 drives the nut 210 to move, the nut 210 will drive the push rod 700 to push the first movable block 411, and then the first movable block 411 squeezes the liquid medium 430 by moving in the connecting through hole 610, so that the second movable block 421 squeezes the pressure sensor 300.

[0058] It is understandable that the setting of the push rod 700 can better realize the connection between the nut 210 and the first movable block 411, so that when the torque is applied to the screw rod 200 for the first time, the screw rod 200 drives the nut 210, and the nut 210 pushes the first movable block 411 through the push rod 700, so that the second movable block 421 can quickly squeeze the pressure sensor 300, thereby improving the rapidity of the detection of the efficiency of the screw rod 200 and facilitating use. Further, through the setting of the accommodating cavity 710, the end of the screw rod 200 close to the pressure sensor 300 can be extended into the accommodating cavity 710, and during the entire detection process, the screw rod 200 is partially in the accommodating cavity 710, thereby better shortening the overall size of the tooling of this embodiment, making it more convenient to use.

[0059] It should be further explained that one end of the push rod 700 close to the pressure sensor 300 is arranged to abut against the first movable block 411, so that on the one hand, the push rod 700 can be in direct contact with the first movable block 411 after assembly, so that the screw rod 200 drives the nut 210 and the nut 210 pushes the first movable block 411 through the push rod 700 at the same time; on the other hand, after the connecting block 600 and the support seat 100 are disassembled, the push rod 700 and the first movable block 411 can be separated, so that the elastic member 400 can be replaced or repaired better, and different screw rods 200 can be replaced for testing better.

[0060] In some embodiments, a square groove 201 is provided on the end surface of the input end of the screw rod 200 , and the square groove 201 can be used to better load torque on the screw rod 200 and realize the self-rotation of the screw rod 200 .

[0061] Second, combining Figure 2 and Figure 3 As shown, based on the above-mentioned tooling for testing the efficiency of the screw rod, this embodiment also provides a method for testing the efficiency of the screw rod, including:

[0062] Step S100: performing loss check on the flexible device during thrust transmission.

[0063] In this step, the movement of the first seal 410 in the connecting through hole 610, the movement of the second seal 420 in the connecting through hole 610, and the compression of the liquid medium 430 will cause the loss of the thrust applied by the nut 210 through the push rod 700, and thus the final detection value of the pressure sensor 300 is smaller than the thrust actually applied by the nut 210 through the push rod 700. Therefore, before starting to test the screw rod 200, it is necessary to perform a loss check on the flexible device to obtain the thrust loss coefficient of the flexible device, and then when testing the screw rod 200, the actual thrust of the nut 210 can be calculated through the thrust loss coefficient and the detection value of the pressure sensor 300.

[0064] Step S200 , applying torque to the screw rod 200 so that the screw rod 200 drives the nut 210 to squeeze the pressure sensor 300 through the flexible device.

[0065] In this step, torque is applied to the screw rod 200 through the square groove 201 on the input end of the screw rod 200, so that the screw rod 200 drives the nut 210 through self-rotation to drive the push rod 700 and the first movable block 411 to squeeze the liquid medium 430. The liquid medium 430 is compressed and then squeezes the second movable block 421, so that the second movable block 421 squeezes the pressure sensor 300, thereby realizing the transmission of thrust to the nut 210.

[0066] Step S300 , the final transmission efficiency of the screw rod 200 is calculated based on the loss check of the flexible device, the detection value of the pressure sensor 300 after the torque is applied to the screw rod 200 , the lead of the screw rod 200 and the torque applied to the screw rod 200 .

[0067] In this step, combined with the thrust loss coefficient of the flexible device obtained in step S100, the detection value of the pressure sensor 300 after the torque is applied to the screw rod 200 in S200, the lead of the screw rod 200 and the torque applied to the screw rod 200, the transmission efficiency of the screw rod 200 in step S200 can be better calculated.

[0068] It can be understood that by checking the loss of the flexible device before formally testing the screw rod 200, the detection value of the pressure sensor 300 during the formal test can be processed in a targeted manner, thereby obtaining a more accurate thrust of the nut 210, thereby making the transmission efficiency result of the screw rod 200 obtained by calculation more accurate.

[0069] In some embodiments, in step S100, when the flexible device is subjected to loss check, the connecting block 600 is disassembled from the support seat 100 and the base 500, and a pressure detector (not shown in the figure) is set on one side of the flexible device, for example, a pressure detector is set on one side of the second movable block 421, and then a thrust F1 is applied to the first movable block 411, so that the first movable block 411 squeezes the liquid medium 430, and the liquid medium 430 is compressed and squeezes the second movable block 421, so that the second movable block 421 squeezes the pressure detector, and the detection value F′ of the pressure detector is obtained, and then the thrust loss coefficient μ=F1 / F′ of the flexible device is calculated based on the applied thrust F1 and the detection value F′ of the pressure detector.

[0070] Through the above-mentioned loss verification of the flexible device, the thrust loss coefficient μ of the flexible device can be better obtained, and then when the screw rod 200 is formally tested in step S200, the detection value of the pressure sensor 300 is multiplied by the thrust loss coefficient of the flexible device to obtain the actual thrust of the nut 210, and then a more accurate transmission efficiency of the screw rod 200 can be obtained through a more accurate calculation of the thrust of the nut 210.

[0071] Furthermore, in step S200, the flexible device that has passed the loss test is first installed with the support seat 100 and the base 500, and then the torque T is applied to the screw rod 200, so that the screw rod 200 rotates to drive the nut 210 to drive the push rod 700 to squeeze the pressure sensor 300 through the flexible device, and the lead L of the screw rod 200 and the detection value F2 of the pressure sensor 300 in this process are obtained. In step S300, the actual thrust F1=F2×μ of the nut 210 is first calculated, and then the transmission efficiency η=F1L / 2πT of the screw rod 200 is calculated.

[0072] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the patent of the present invention.

Claims

1. A tool for testing the efficiency of a screw rod, characterized in that: It comprises a support seat, a screw rod arranged at the support seat, and a nut sleeved on the screw rod; the screw rod can rotate circumferentially at the support seat, and the nut can move along the axial direction of the screw rod during the rotation of the screw rod; The support seat is also provided with a pressure sensor and a flexible device; the pressure sensor is arranged in the axial direction of the screw rod, and the flexible device is arranged between the pressure sensor and the screw nut; The rotation of the screw rod can drive the nut to move toward the pressure sensor and squeeze the pressure sensor through the flexible device.

2. The tooling according to claim 1, characterized in that: A base for mounting the pressure sensor and a connecting block connecting the base and the support base are provided on one side of the support base; A connecting through hole is arranged in the connecting block, and the flexible device is arranged in the connecting through hole.

3. The tooling according to claim 2, characterized in that: The flexible device includes an elastic member movable along the axial direction of the connecting through hole.

4. The tooling according to claim 3, characterized in that: The elastic member includes a first sealing member and a second sealing member, and a liquid medium is filled between the first sealing member and the second sealing member. The first sealing member and the second sealing member can seal the liquid medium in the connecting through hole.

5. The tooling according to claim 1, characterized in that: The support seat is provided with a shell, and the shell is provided with a loading through hole; the input end of the screw rod is rotatably arranged in the loading through hole through a bearing.

6. The tooling according to claim 5, characterized in that: The housing and / or the support seat is provided with an anti-rotation sleeve capable of cooperating with the nut. When the nut moves on the screw rod, the anti-rotation sleeve can limit the circumferential rotation of the nut.

7. The tooling according to claim 1, characterized in that: A push rod is arranged between the flexible device and the nut, and when the screw rod rotates, the nut presses the flexible device through the push rod.

8. A method for testing the efficiency of a screw, characterized in that: The tooling according to any one of claims 1 to 7 comprises: Verify the loss of the flexible device during thrust transmission; Applying torque to the screw rod so that the screw rod drives the nut to squeeze the pressure sensor through the flexible device; The transmission efficiency of the screw shaft is calculated based on the loss check, the detection value of the pressure sensor, the lead of the screw shaft, and the torque.

9. The method according to claim 8, characterized in that: When performing loss check on the flexible device during thrust transmission, a pressure detector is arranged on one side of the flexible device, and thrust is applied to the flexible device so that the flexible device squeezes the pressure detector; A thrust loss coefficient is calculated based on the thrust and the detection value of the pressure detector.

10. The method according to claim 8, characterized in that: The torque is applied to the screw rod after the flexible device is assembled to the tooling.

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