Pre-tightening force tool

Abstract

The utility model provides a pre-tightening force tool, which comprises a shell, a pre-tightening force assembly, a pre-tightening force assembly and a pre-tightening force detection assembly, and is characterized in that the shell is configured to be fixedly arranged on one part of a device; the pre-tightening force tool comprises a shell and a pre-tightening bolt, the pre-tightening bolt is installed on the shell and can rotate relative to the shell so as to apply pressure to the other part of the device, and the pre-tightening force tool further comprises a pressure sensor and a controller, the pressure sensor is integrated on the shell and is configured to be used for measuring a pressure value applied by the pre-tightening bolt; and the digital display circuit board is connected with the pressure sensor, is integrated in the shell and comprises a display module for displaying the pressure value. According to the pre-tightening force tool, the pressure value can be measured and displayed in real time in the pressure applying process.

Description

Technical Field

[0001] The utility model relates to a preloading tooling for applying preloading force to mechanical parts such as bearings. Background Art

[0002] Preloading can improve the stiffness and rotational accuracy of bearings under working conditions. For bearings that bear large loads and have high requirements for rotational accuracy, they mostly work in a state of no clearance or even a small amount of interference. In this case, it is necessary to preload the bearings during assembly.

[0003] Currently, when adjusting the bearing clearance or preloading the bearing, an axial pressure is applied to the inner ring or outer ring of the bearing through a spring mechanical structure tool as Figures 1-3 shown to eliminate the bearing clearance and cause deformation at the contact points between the rolling elements and the inner and outer rings. As Figures 1-3 shown, the tool consists of a housing 1', a spring 2' (disc spring, rectangular spring, etc.), a long bolt 3', an intermediate pin 4', a snap ring 5', etc. Three adjusting set screws 6' are also assembled on the cylindrical end face of the housing 1' for adjusting the compression amount of the spring. During the working process, the housing 1' is fixed to the box body of the gearbox by means of fasteners, so that the end of the long bolt 3' abuts against the outer ring of the bearing; then the long bolt 3' is tightened by means of a tightening tool. After the long bolt 3' rotates, it will press the intermediate pin 4' against the spring 2', thereby transmitting the pressure generated by the spring 2' to the outer ring of the bearing through the long bolt 3'.

[0004] The above-mentioned spring mechanical structure tool generates pressure through the deformation of the spring 2' and further transmits the pressure to the bearing through the long bolt 3'. Therefore, each type of spring mechanical structure tool can only provide an accurate fixed pressure value after one calibration. However, there are various types of bearings, and different pressure values need to be applied when adjusting their clearances. In addition, when different operators use the same spring mechanical structure tool to apply pressure, the repeatability of the obtained pressure is very poor.

[0005] The above problems will affect the adjustment of the bearing clearance of the gearbox and ultimately affect the service life of the gearbox. Summary of the Utility Model

[0006] In order to solve one or more problems existing in the prior art, the utility model proposes a digital preloading tooling. The digital preloading tooling is integrated with a pressure sensor and a display module, and can measure and display the pressure value in real time during the process of applying pressure, so as to accurately provide a series of pressure values through a single tooling, thereby improving the repeatability of the pressure values obtained by different operators when using this tooling. In addition, the digital preloading tooling is integrated with a data transmission module, enabling the tool to interact with the MES system to realize the upload and recording of the pressure value.

[0007] Specifically, the present utility model proposes a pre-tightening force tooling, which includes: a housing configured to be fixedly installed on a part of the device; and a pre-tightening bolt installed on the housing and capable of rotating relative to the housing to apply pressure to another part of the device. Wherein, the pre-tightening force tooling further includes: a pressure sensor integrated on the housing and configured to measure the pressure value applied by the pre-tightening bolt; and a digital display circuit board connected to the pressure sensor, the digital display circuit board being integrated in the housing and including a display module for displaying the pressure value.

[0008] In one embodiment, the pressure sensor is an annular sensor, and the annular sensor is installed in a circular groove of the housing and is in clearance fit with the circular groove.

[0009] In one embodiment, the central hole of the annular sensor is a through hole, and the pre-tightening force tooling further includes an intermediate transmission pin shaft, the intermediate transmission pin shaft including a central threaded hole and an annular flange extending radially outward. Wherein, the central threaded hole is used for threaded connection with the pre-tightening bolt so that the pre-tightening bolt can rotate in the central threaded hole, the annular sensor is sleeved on the intermediate transmission pin shaft and is supported by the annular flange, and the annular sensor and the intermediate transmission pin shaft are installed together in the circular groove of the housing and are in clearance fit with the circular groove.

[0010] In one embodiment, the pre-tightening force tooling further includes a washer sleeved on the intermediate transmission pin shaft, wherein the pressure sensor is located between the washer and the annular flange of the intermediate transmission pin shaft.

[0011] In one embodiment, the center of the annular sensor is a threaded hole, and wherein, the threaded hole is used for threaded connection with the pre-tightening bolt so that the pre-tightening bolt can rotate in the threaded hole.

[0012] In one embodiment, the pressure sensor includes a strain gauge, and the strain gauge is mounted on the surface of the housing or embedded inside the housing.

[0013] In one embodiment, the digital display circuit board further includes a data transmission module configured to send the pressure value to an external device.

[0014] In one embodiment, the external device includes a manufacturing execution system for managing and monitoring the production process.

[0015] In one embodiment, the pre-tightening force tooling further includes: a switch assembly installed in the housing, the switch assembly including a switch, a charging socket, and a switch support, the switch and the charging socket being installed on the switch support; and a lithium battery pack installed in the housing, the lithium battery pack being configured to serve as a power source for the pressure sensor and the digital display circuit board, and wherein the charging socket is configured to charge the lithium battery pack.

[0016] In one embodiment, the resistance of the pressure sensor varies with the change in the pressure applied to the pressure sensor.

[0017] Generally speaking, the various embodiments of the present invention can be combined and coupled in any possible way within the scope of the present invention. These and other aspects, features, and / or advantages of the present invention will be apparent and elucidated with reference to the embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present invention will be described only by way of example with reference to the following drawings, in which:

[0019] Figure 1 is a perspective view of a prior art spring mechanical structure tool;

[0020] Figure 2 is Figure 1 a cross-sectional view of the spring mechanical structure tool shown;

[0021] Figure 3 is Figure 1 a front view of the spring mechanical structure tool shown;

[0022] Figure 4 is a perspective view of a pre-tightening force tooling according to a first embodiment of the present invention;

[0023] Figure 5 is Figure 4 a front view of the pre-tightening force tooling shown;

[0024] Figure 6 is Figure 4 a top view of the pre-tightening force tooling shown;

[0025] Figure 7 is along Figure 6 the cross-sectional view taken along line A-A in

[0026] Figure 8a is Figure 7 a top view of the through-hole type pressure sensor shown;

[0027] Figure 8b is along Figure 8a the cross-sectional view taken along line B-B in

[0028] Figure 9 is a perspective view of the pre-tightening force tooling according to the second embodiment of the present utility model;

[0029] Figure 10 is Figure 9 a front view of the pre-tightening force tooling shown;

[0030] Figure 11 is Figure 9 a top view of the pre-tightening force tooling shown;

[0031] Figure 12 is a cross-sectional view taken along line C-C in Figure 11 ;

[0032] Figure 13a is Figure 12 a top view of the threaded hole type pressure sensor shown;

[0033] Figure 13b is a cross-sectional view taken along line D-D in Figure 13a ;

[0034] Figure 14 is a perspective view of the pre-tightening force tooling according to the third embodiment of the present utility model;

[0035] Figure 15 is Figure 14 a front view of the pre-tightening force tooling shown;

[0036] Figure 16 is Figure 14 a top view of the pre-tightening force tooling shown;

[0037] Figure 17 is a cross-sectional view taken along line E-E in Figure 16 ;

[0038] Figure 18a is a front view of the digital display circuit board of the pre-tightening force tooling according to the embodiment of the present utility model; and

[0039] Figure 18b is Figure 18a a right side view of the digital display circuit board shown.

[0040] It should be understood that the drawings only show exemplary ways of implementing the present utility model and should not be construed as a limitation on other possible embodiments falling within the scope of the appended claims. The protection scope of the present utility model is only defined by the appended claims. Detailed Description of the Invention

[0041] The specific embodiments of the present utility model and their variations will be described in detail below with reference to the drawings.

[0042] For ease of description, in this text, spatial relative terms such as "inner", "outer", "upper", "lower", "top", "bottom", "front", "rear", etc. may be used to define the relative positions of various components. However, this is only for the orientation of the device shown in the drawings and does not have a restrictive meaning. When the orientation of the device changes, these spatial relative relationships can also be reversed or changed without affecting the scope of protection of the present utility model.

[0043] Reference will be made to Figures 4-8b describe in detail the pre-tightening force tooling 10 according to the first embodiment of the present utility model. Among them, Figure 4 is a perspective view of the pre-tightening force tooling 10 according to the first embodiment of the present utility model;

[0044] Figure 5 is Figure 4 the front view of the pre-tightening force tooling 10 shown in Figure 6 is Figure 4 the top view of the pre-tightening force tooling 10 shown in Figure 7 is a cross-sectional view taken along the line A-A in Figure 6 ; Figure 8a is Figure 7 the top view of the through-hole type pressure sensor 14 shown in Figure 8b and is Figure 8a a cross-sectional view taken along the line B-B in

[0045] As Figures 4-8b shown, the pre-tightening force tooling 10 includes a housing 11, a fixing bolt 12, a pre-tightening bolt 13, a pressure sensor 14, an intermediate transmission pin 15, a digital display circuit board 16, a switch assembly 17, a lithium battery pack 18, etc.

[0046] The housing 11 is configured to be fixedly installed on a part (such as a housing) of a device (such as a gearbox), and includes an elongated rectangular parallelepiped portion 11a and a semi-cylindrical portion 11b. The elongated rectangular parallelepiped portion 11a extends from one end face to the other end face along the longitudinal axis, and at this other end face, it completely coincides with the planar inner side surface of the semi-cylindrical portion 11b, such that the top surface of the rectangular parallelepiped portion 11a is flush with the top surface of the semi-cylindrical portion 11b, the bottom surface of the rectangular parallelepiped portion 11a is flush with the bottom surface of the semi-cylindrical portion 11b, and the two side surfaces (i.e., the front side surface and the rear side surface) of the rectangular parallelepiped portion 11a are tangent to the arc-shaped outer side surface of the semi-cylindrical portion 11b. Although the rectangular parallelepiped portion 11a and the semi-cylindrical portion 11b are described above as two separate parts, this is only for ease of description of the structural shape. In fact, the housing 11 can be an integral body, and the rectangular parallelepiped portion 11a and the semi-cylindrical portion 11b can be formed by processing the same piece or multiple pieces of raw materials during the processing.

[0047] Furthermore, the housing 11 may include a runway-shaped mounting hole H extending along the longitudinal direction. Specifically, the mounting hole H may be disposed on the rectangular parallelepiped portion 11a near the semi-cylindrical portion 11b and penetrate from the top surface to the bottom surface of the rectangular parallelepiped 11a to form a through hole. It will be understood that the mounting hole H is not limited to the runway shape, but may be any suitable shape. The mounting hole H is used to fixedly mount the pre-tightening force tooling 10 on a gearbox or other mechanical device, which will be described in further detail below.

[0048] The fixing bolt 12 may be a modified hexagon head full-thread bolt, including a radially outwardly extending annular flange at the bolt head. The outer diameter dimension of the annular flange is larger than the dimension of the above-mentioned mounting hole H, so that the bolt head of the fixing bolt 12 cannot pass through the mounting hole H. During use, the screw of the fixing bolt 12 passes through the mounting hole H and is threadedly connected to the threaded hole on the gearbox or other mechanical device, while the bolt head of the fixing bolt 12, especially its annular flange, abuts against the surface of the housing 11, thereby fixedly mounting the entire pre-tightening force tooling 10 on the gearbox or other mechanical device.

[0049] The pre-tightening bolt 13 is mounted on the housing 11 and can rotate relative to the housing 11 to apply pressure to another part of the device (such as the outer ring of a bearing).

[0050] The housing 11 is provided with a circular groove for mounting the pressure sensor 14 and the intermediate transfer pin 15 at the end near the semi-cylindrical portion 11b, and the circular groove can be accessed through the bottom side of the housing 11. The circular groove may be concentrically arranged with the semi-cylindrical portion 11.

[0051] Reference Figure 8a and Figure 8b, the pressure sensor 14 is an annular sensor, and its central hole is a through hole. The pressure sensor 14 also includes a cable 14a for signal / electricity transmission. The intermediate transfer pin 15 is a circular cylindrical pin, including a central threaded hole and an annular flange extending radially outward. The central threaded hole is used for threaded connection with the pre-tightening bolt 13, and the annular flange is used to receive the annular pressure sensor 14. In particular, the outer diameter of the intermediate transfer pin 15 matches the inner diameter of the central through hole of the pressure sensor 14, so that the pressure sensor 14 can be sleeved on the intermediate transfer pin 15 and have a clearance fit therewith. In addition, the outer diameter of the pressure sensor 14 is equal to the outer diameter of the annular flange of the intermediate transfer pin 15, so that when the pressure sensor 14 is sleeved on the intermediate transfer pin 15 and installed in place, the pressure sensor 14 is supported on the annular flange, and the outer wall of the pressure sensor 14 is flush with the outer wall of the annular flange of the intermediate transfer pin 15. Further, the outer diameter of the pressure sensor 14 and the outer diameter of the annular flange of the intermediate transfer pin 15 match the inner diameter of the circular groove of the housing 11, so that the pressure sensor 14 and the intermediate transfer pin 15 can be installed closely against the inner wall of the circular groove and have a clearance fit therewith.

[0052] During the assembly process, the pressure sensor 14 can be first sleeved on the intermediate transfer pin 15, and then they are placed together into the circular groove of the housing 11. The washer 19 can also be sleeved on the intermediate transfer pin 15 above the pressure sensor 14, that is, the pressure sensor 14 is located between the washer 19 and the annular flange of the intermediate transfer pin 15. This can optimize the contact between the pressure sensor 14 and the intermediate transfer pin 15, and thus optimize the force transmission between these two components. Then, the pressure sensor 14, the intermediate transfer pin 15 and the washer 19 are fixed in place by a snap ring. Subsequently, the pre-tightening bolt 13 can be screwed into the central threaded hole of the intermediate transfer pin 15 through the opening on the top side of the housing 11. Thus, when the pre-tightening bolt 13 is rotated by an external tool to apply pressure, the intermediate transfer pin 15 transfers the pressure to the connected pressure sensor 14. The pressure sensor 14 generates a small deformation under the action of this pressure, so that its resistance value changes, thereby generating an electrical signal corresponding to the change in pressure. That is, the resistance of the pressure sensor 14 changes with the change in the pressure applied to the pressure sensor 14.

[0053] The housing 11 is provided with a groove at the end away from the semi-cylindrical portion 11b for mounting the digital display circuit board 16, the switch assembly 17, and the lithium battery pack 18. The groove is generally rectangular in shape and can be accessed through the top side and the end face of the housing 11. The digital display circuit board 16, the switch assembly 17, and the lithium battery pack 18 can be integrated into a single unit and mounted into the groove from the top side of the housing 11. Subsequently, the groove is closed by the top side cover plate C to fix the components mounted inside the groove and prevent them from being affected by external foreign objects (such as dust and moisture, etc.). Further, an opening can be provided on the top side cover plate C to expose the display module of the digital display circuit board 16. Alternatively, a transparent window can be provided on the top side cover plate C so that the operator can see the display module of the digital display circuit board 16 through the window. In addition, after the digital display circuit board 16, the switch assembly 17, and the lithium battery pack 18 are mounted into the groove, a part of the switch assembly 17 (such as the switch 17a and the charging socket 17c described below) is exposed through the opening on the end face of the housing 11. Thus, the operator can operate the switch assembly 17 via this opening.

[0054] The lithium battery pack 18 is configured to be used as the power source for the digital display circuit board 16 and the pressure sensor 14. Therefore, the lithium battery pack 18 is electrically connected to the digital display circuit board 16 and the pressure sensor 14. In particular, the cable 14a of the pressure sensor 14 can be connected to the lithium battery pack 18 through a groove provided in the side surface of the housing 11, and the groove can be closed with a side cover plate. Alternatively, the cable 14 of the pressure sensor 14 can also be connected to the lithium battery pack 18 through a groove provided in the bottom surface of the housing 11, and the groove can be closed with a bottom cover plate. Since the bottom surface of the digital pre-tightening force tooling 10 is not visible during use, the structure with the bottom cover plate is more aesthetically pleasing than the structure with the side cover plate.

[0055] The switch assembly 17 includes a switch 17a and a switch support 17b. The switch 17a is mounted on the switch support 17b and is relatively fixed to the lithium battery pack 18 by means of the switch support 17b. The switch 17a is used to turn on / off the power supply to the digital display circuit board 16 and the pressure sensor 14. When the switch 17a is in the "ON" position (such as the pressed position), the power to the digital display circuit board 16 and the pressure sensor 14 is turned on, and when the switch 17a is in the "OFF" position (such as the popped-up position), the power to the digital display circuit board 16 and the pressure sensor 14 is turned off. In addition, in the case where the lithium battery pack 18 is a rechargeable battery, the switch assembly 17 can also include a charging socket 17c provided on the switch support 17b. The charging socket 17c is configured to charge the lithium battery pack 18 and is exposed together with the switch 17a through the opening on the end face of the housing 11 to facilitate the insertion of the charging plug.

[0056] The following will be further combined withFigure 18a and Figure 18b Describe the functions of the digital display circuit board 16 in detail. Figure 18a is a front view of the digital display circuit board of the pre-tightening force tooling according to an embodiment of the present invention, and Figure 18b is Figure 18a a right view of the digital display circuit board shown.

[0057] The digital display circuit board 16 is connected to the pressure sensor 14 through the cable 14a, and includes a signal conversion module 16a, a display module 16b, a data transmission module 16c, a program setting / calibration module 16d, etc., as Figure 18a and Figure 18b shown.

[0058] The signal conversion module 16a can be used to convert the electrical signal measured by the pressure sensor 14 into a digital signal corresponding to the magnitude of the pressure value, and send the converted digital signal to the display module 16b and the data transmission module 16c. On the one hand, the pressure value is displayed through the display module 16, and on the other hand, the pressure value is sent to an external device through the data transmission module 16c.

[0059] The display module 16b can be a display screen, which is used to display the digital signal in the form of a numerical value, so that the operator can know the magnitude of the currently applied pressure in real time and adjust the operation of the pre-tightening bolt 13 based on the magnitude of the current pressure. For example, if the currently applied pressure is less than the desired pressure, the pre-tightening bolt 13 is further tightened; if the currently applied pressure is greater than the desired pressure, the tightening bolt 13 can be appropriately loosened. Since the display module 16b can display the magnitude of the pressure value currently applied by the pre-tightening force tooling 10 in real time and accurately, when different operators use the pre-tightening force tooling 10 to apply the same pressure value, the repeatability of the obtained pressure value is very good. In other words, excluding measurement errors, when different operators use the pre-tightening force tooling 10 to apply the same pressure value, the obtained pressure values are basically the same. In addition, since the display screen is embedded or integrated on the pre-tightening force tooling 10, there is no need for external connection, and the whole tooling is cleaner and more compact, which is convenient for carrying and moving. The operator can directly read the pre-tightening force data on the pre-tightening force tooling 10 by means of this display screen, without having to shift the line of sight to an external display, which improves the convenience and safety of the operation. Moreover, the embedded display screen can immediately display the magnitude of the pre-tightening force, without having to transmit data through an external connection, reducing the delay of data transmission.

[0060] The data transmission module 16c is configured to communicate wirelessly / wiredly with an external device, upload the measured pressure value to the external device for recording. The external device can be a Manufacturing Execution System (MES system) for managing and monitoring the production process. The data transmission module 16c interacts with the MES system to achieve the upload and recording of the measured pressure value. This helps to promptly detect pre-tightening force deviations, respond quickly and take measures. In addition, it also facilitates subsequent quality issue tracking and analysis, and improves the reliability of bearing pre-tightening, etc.

[0061] The program setting / calibration module 16d is used for program setting, calibration, etc. It allows the operator to set various operating parameters of the pre-tightening tooling 10, and calibrate the internal clock, analog-to-digital converter, digital-to-analog converter, etc. to ensure accuracy. The program setting / calibration module 16d can also be used to calibrate the pressure sensor 14, etc.

[0062] Although the various functions of the digital display circuit board 16 are described above with multiple different modules, the above functions are not necessarily distributed on different modules, but can be integrated in fewer modules in different combinations, or further subdivided and distributed in more modules. The present utility model is not limited to the specific embodiments described above.

[0063] Next, reference will be made to Figures 9-13b Describe the pre-tightening tooling 20 according to the second embodiment of the present utility model. Among them, Figure 9 is a perspective view of the pre-tightening tooling 20 according to the second embodiment of the present utility model; Figure 10 is Figure 9 the front view of the pre-tightening tooling 20 shown in Figure 11 is Figure 9 the top view of the pre-tightening tooling 20 shown in Figure 12 is along Figure 11 the cross-sectional view taken along the line C-C in Figure 13a is Figure 12 the top view of the threaded hole type pressure sensor 24 shown in Figure 13b is along Figure 13a the cross-sectional view taken along the line D-D in

[0064] Similar to the pre-tightening tooling 10, the pre-tightening tooling 20 includes a housing 21, a fixing bolt 22, a pre-tightening bolt 23, a pressure sensor 24, a digital display circuit board 26, a switch assembly 27, a lithium battery pack 28, etc. For the parts that are the same as those of the pre-tightening tooling 10, they will not be described in detail here. Only the differences between the pre-tightening tooling 20 and the pre-tightening tooling 10 will be described in detail below.

[0065] Specifically, refer to Figure 12, Figure 13a and Figure 13b , the preloading tooling 20 does not include an intermediate transfer pin shaft, and the preloading bolt 23 is directly threadedly connected to the pressure sensor 24. Correspondingly, the pressure sensor 24 of the preloading tooling 20 is an annular sensor, and its central hole is a threaded hole for threadedly connecting with the preloading bolt 23. The pressure sensor 24 is fixedly installed in the circular groove of the housing 21 by a plurality of screws 29. Since the pressure sensor 24 is directly threadedly connected to the preloading bolt 23, when the preloading bolt 23 applies pressure to the outer ring of the bearing, this pressure will directly act on the pressure sensor 24 through the preloading bolt 23. The pressure sensor 24 generates a small deformation under the action of this pressure, causing its resistance value to change, thereby generating an electrical signal corresponding to the change in pressure. Compared with the preloading tooling 10, the accuracy of the preloading tooling 20 is better.

[0066] Next, the preloading tooling 30 according to the third embodiment of the present invention will be described with reference to Figures 14-17 . Among them, Figure 14 is a perspective view of the preloading tooling 30 according to the third embodiment of the present invention; Figure 15 is Figure 14 the front view of the preloading tooling 30 shown in Figure 16 is Figure 14 the top view of the preloading tooling 30 shown in Figure 17 and Figure 16 is a cross-sectional view taken along the line E-E in

[0067] Similar to the preloading tooling 10, the preloading tooling 30 includes a housing 31, a fixing bolt 32, a preloading bolt 33, a pressure sensor 34, a digital display circuit board 36, a switch assembly 37, a lithium battery pack 38, etc. For the parts that are the same as those of the preloading tooling 10, they will not be described in detail here. Only the differences between the preloading tooling 30 and the preloading tooling 10 will be described in detail below.

[0068] Specifically, referring to Figure 17 , the preloading tooling 30 does not include an annular pressure sensor, and correspondingly does not include a circular groove for installing the annular pressure sensor. Instead, the pressure sensor 34 of the preloading tooling 30 is a strain gauge. This strain gauge can be mounted on the side surface of the housing 31 and connected to the digital display circuit board 36 and the lithium battery pack 38 through conductive wires. For easy mounting, a groove for mounting the strain gauge can be opened on the side surface of the housing 31. Instead, as Figure 17As shown, the strain gauge can also be embedded inside the housing 31. In addition, the pre-tightening bolt 33 is threadedly connected to the threaded hole on the housing 31. Thus, when pressure is applied to the outer ring of the bearing by rotating the pre-tightening bolt 33, the housing 31 itself transmits this pressure to the strain gauge. The strain gauge undergoes a small deformation under the action of this pressure, causing a change in its resistance value, thereby generating an electrical signal corresponding to the change in pressure. Thus, the strain gauge will be able to measure the magnitude of the applied pressure.

[0069] As can be seen from the above-described multiple embodiments, the pre-tightening force tooling 10, 20, 30 according to the present utility model integrates different forms of pressure sensors 14, 24, 34 and digital display circuit boards 16, 26, 36, and can measure and display the applied pressure value in real time during use, thereby being able to accurately provide a series of pressure values. In addition, the pre-tightening force tooling 10, 20, 30 can also interact with the MES system through a data transmission module to achieve the upload and recording of pressure values. The present utility model does not limit the form of the pressure sensor used for measuring pressure.

[0070] In each of the above embodiments, embodiments of the pre-tightening force tooling according to the embodiments of the present utility model for bearing pre-tightening are described. It will be understood that the above pre-tightening force tooling can also be used in usage scenarios for applying pressure to other mechanical parts.

[0071] Although the present utility model has been described in connection with the above specific embodiments, it should not be construed as being limited in any way to the examples presented. The scope of the present utility model is defined by the appended claims. In the context of the claims, the terms "comprising" or "including" do not exclude other possible elements or steps. Additionally, references to "a" or "an" should not be construed as excluding a plurality. The use of reference signs of elements shown in the drawings in the claims should also not be construed as limiting the scope of the present utility model. Furthermore, the various features mentioned in different claims may be advantageously combined, and the mention of these features in different claims does not exclude the combination of these features from being possible and advantageous. Additionally, the "first", "second", and "third", etc. used in the present utility model are only used to distinguish relevant components or embodiments, and are not intended to assign any priority-related attributes to them.

Claims

1. A preload tool, comprising: a housing configured to be fixedly mounted on a portion of the device; and a pre-tensioning bolt mounted on the housing and rotatable relative to the housing to apply pressure to another part of the device, Characterized in that, the preload tooling further comprises: a pressure sensor, the pressure sensor being integrated on the housing and configured to measure a pressure value applied by the pre-tightening bolt; and A digital display circuit board connected to the pressure sensor, wherein the digital display circuit board is integrated in the housing and comprises a display module for displaying the pressure value.

2. The preload tooling according to claim 1, characterized in that: The pressure sensor is an annular sensor, which is installed in the circular groove of the housing and has a clearance fit with the circular groove.

3. The preload tooling according to claim 2, characterized in that: The center hole of the annular sensor is a through hole, and the preload tooling also includes an intermediate transmission pin shaft, and the intermediate transmission pin shaft includes a central threaded hole and an annular flange extending radially outward. Among them, the center threaded hole is used for threaded connection with the pre-tightening bolt, so that the pre-tightening bolt can rotate in the center threaded hole, the annular sensor is sleeved on the intermediate transmission pin and supported by the annular flange, and the annular sensor is installed in the circular groove of the shell together with the intermediate transmission pin and is clearance-matched with the circular groove.

4. The preload tooling according to claim 3, characterized in that: The preload tool further includes a washer sleeved on the intermediate transfer pin shaft, wherein the pressure sensor is located between the washer and the annular flange of the intermediate transfer pin shaft.

5. The preload tooling according to claim 2, characterized in that: The center of the annular sensor is a threaded hole, and the threaded hole is used for threaded connection with the pre-tightening bolt, so that the pre-tightening bolt can rotate in the threaded hole.

6. The preload tooling according to claim 1, characterized in that: The pressure sensor comprises a strain gauge, and the strain gauge is mounted on the surface of the housing or embedded in the housing.

7. The preload tool according to any one of claims 1 to 6, characterized in that: The digital display circuit board also includes a data transmission module, and the data transmission module is configured to send the pressure value to an external device.

8. The preload tooling according to claim 7, characterized in that: The external devices include a manufacturing execution system for managing and monitoring a production process.

9. The preload tool according to claim 1, characterized in that: The preload tooling also includes: a switch assembly installed in the housing, the switch assembly comprising a switch, a charging socket and a switch support, the switch and the charging socket being installed on the switch support; and A lithium battery pack installed in the housing, the lithium battery pack being configured to be used as a power source for the pressure sensor and the digital display circuit board, and Wherein, the charging socket is configured to charge the lithium battery pack.

10. The preload tool according to claim 1, characterized in that: The resistance of the pressure sensor changes as the pressure applied to the pressure sensor changes.

Images