A performance test bench for elastic foil air dynamic thrust bearing

Abstract

The present application provides an elastic foil pneumatic thrust bearing performance test bench, which belongs to the technical field of bearing testing, and specifically includes a workbench, a driving member, a thrust plate, a test shaft, a radial static pressure bearing, a foil mounting plate, a loading assembly, an impact simulation assembly and a measuring assembly; the thrust plate is horizontally mounted on the output end of the driving member; the radial static pressure bearing is fixedly mounted on the workbench, the test shaft is mounted in the radial static pressure bearing, both ends of the test shaft extend out of the radial static pressure bearing, the bottom end of the test shaft is connected to the foil mounting plate, the test shaft is connected to the impact simulation assembly, the loading assembly is fixed on the test shaft, and the measuring assembly is mounted on the workbench; the loading assembly provides a changeable loading force for the test shaft, the impact simulation assembly controls the test shaft to accelerate toward the thrust plate, and the measuring assembly measures the state of the thrust plate and the foil mounting plate. Through the processing scheme of the present application, the comprehensiveness of the elastic foil pneumatic thrust bearing performance test is improved.

Description

Technical Field

[0001] The present application relates to the field of bearing testing, and in particular to an elastic foil aerodynamic thrust bearing performance testing bench. Background Art

[0002] The elastic foil pneumatic thrust bearing is a foil bearing structure formed from multiple metal foils within a bearing body. It uses ambient gas as a lubricant and foils as elastic support elements. Major types include cantilever, wound, corrugated, and external wedge. One end of the foil in the thrust bearing is embedded within the foil mounting plate, while the other end freely overlaps with adjacent foils, creating multiple wedge-shaped gaps between the foil mounting plate and the thrust plate. When the two plates rotate relative to each other at high speed, a load-bearing air film is generated between the two plates. Existing testing facilities for elastic foil pneumatic thrust bearings are not comprehensive enough. Summary of the Invention

[0003] In view of this, the present application provides an elastic foil aerodynamic thrust bearing performance testing bench, which solves the problems in the prior art and can perform a more comprehensive test on the performance of the elastic foil aerodynamic thrust bearing on a single test device.

[0004] The elastic foil aerodynamic thrust bearing performance test bench provided in this application adopts the following technical solution:

[0005] An elastic foil aerodynamic thrust bearing performance test bench comprises a workbench, a driving member, a thrust plate, a test shaft, a radial hydrostatic bearing, a foil mounting plate, a loading assembly, an impact simulation assembly and a measuring assembly;

[0006] The driving member is fixed on the workbench, and the thrust plate is horizontally installed on the output end of the driving member; the radial hydrostatic bearing is fixedly installed on the workbench, and the test shaft is installed in the radial hydrostatic bearing. Both ends of the test shaft extend out of the radial hydrostatic bearing, and the bottom end of the test shaft is connected to the foil mounting plate. The test shaft is connected to the impact simulation assembly, the loading assembly is fixed on the test shaft, and the measuring assembly is installed on the workbench;

[0007] The thrust plate, test shaft, radial hydrostatic bearing and foil mounting plate are coaxially arranged, the loading assembly provides a variable loading force for the test shaft, the impact simulation assembly controls the test shaft to accelerate toward the thrust plate, and the measuring assembly measures the states of the thrust plate and foil mounting plate.

[0008] Optionally, the loading assembly includes annular weight blocks of various mass specifications, at least one of the annular weight blocks is fixedly mounted on the test shaft, and the annular weight blocks surround the outer circumference of the test shaft above the radial static pressure bearing.

[0009] Optionally, a radially protruding protrusion is provided on the outer periphery of the test shaft above the radial hydrostatic bearing, and the bottom end face of the annular gravity block abuts against the protrusion. The loading assembly also includes a clamping nut, which is located above the annular gravity block. The clamping nut presses the annular gravity block onto the protrusion by being threadedly connected to the test shaft.

[0010] Optionally, the impact simulation component includes a control component and a cable connected to the top of the test shaft, the other end of the cable extends vertically upward and is connected to the control component, and the control component controls the rise or fall of the test shaft by tightening or loosening the cable.

[0011] Optionally, the control component includes a gantry bracket, multiple guide wheels, an electromagnet and a magnet. The gantry bracket is installed on the workbench, the magnet is connected to the other end of the cable, the electromagnet is installed on the outside of the side frame of the gantry bracket, and multiple guide wheels are installed parallel to each other on the top frame of the gantry bracket. The cable extends vertically upward, turns through the first guide wheel, passes through the other guide wheels, extends to the edge of the top frame of the gantry bracket, and then extends downward until the magnet contacts the electromagnet.

[0012] Optionally, the control component further includes a telescopic rod, and at least one of the guide wheels is mounted on the portal bracket via the telescopic rod, and the telescopic rod is extended and retracted to drive the guide wheel mounted on the telescopic rod to move in the vertical direction.

[0013] Optionally, the measuring assembly includes a measuring ring, which surrounds the outer circumference of the thrust plate and is fixed on the workbench. A sensor is installed on the measuring ring.

[0014] Optionally, the measuring assembly includes a torsion bar and a torsion measuring mechanism, and the torsion measuring mechanism includes a support frame, a U-shaped swivel pin, a connecting rod, a torque sensor and a counterweight assembly, the support frame is fixed on the workbench, the connecting rod is horizontally and slidably installed on the support frame in the axial direction, one end of the connecting rod is connected to the torque sensor, and the torque sensor is fixed on the workbench, the other end of the connecting rod is connected to the counterweight assembly, the U-shaped swivel pin is installed on the connecting rod, the axial direction of the U-shaped swivel pin is perpendicular to the axial direction of the connecting rod, one end of the torsion bar is connected to the side of the foil mounting disk, and the torsion bar extends along the radial direction of the foil mounting disk, and the torsion bar is placed in the strip groove of the U-shaped swivel pin.

[0015] Optionally, a horizontal through hole is provided on the support frame, the connecting rod passes through the through hole, the connecting rod slides in the through hole, the counterweight assembly includes a counterweight rope, a counterweight block and a guide wheel assembly, one end of the connecting rod is connected to the torque sensor through the adjustment sleeve, the other end of the connecting rod is connected to one end of the counterweight rope, the counterweight rope extends along the axis direction of the connecting rod through the guide wheel assembly, first turns upward and then downward, and the other end of the counterweight rope is connected to the counterweight block.

[0016] In summary, this application has the following beneficial technical effects:

[0017] 1. This application is used to detect the static and dynamic performance of elastic foil-type aerodynamic thrust bearings.

[0018] 2. The loading force and the floating speed of the present application are adjustable, and the response process of the thrust bearing after being subjected to impact disturbance can be simulated and detected.

[0019] 3. This application has high measurement accuracy, a wide variety of measured parameters, and data that is easy to integrate and refine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the test bench for this application;

[0022] Figure 2 This is a schematic structural diagram of the motor, thrust plate and measuring ring according to an embodiment of the present application;

[0023] Figure 3 Schematic diagram of the structure of the test shaft and thrust plate installation for this application;

[0024] Figure 4 This is a schematic diagram of the structure of the torsion bar and torque measurement mechanism of this application;

[0025] Figure 5 This is a structural diagram of the portal bracket and telescopic rod of this application.

[0026] Explanation of the accompanying reference numerals: 1. Driving member; 11. Workbench; 12. Gantry bracket; 15. Displacement sensor; 16. Temperature sensor; 17. Speed ​​sensor; 18. Torsion bar; 19. Torque measuring mechanism; 1901. Torque sensor; 1902. Fixing frame; 1903. Adjusting sleeve; 1904. U-shaped swivel pin; 1905. Support frame; 1906. Guide wheel assembly; 1907. Counterweight rope; 1908. Connecting rod; 1909. Counterweight block; 2. Thrust plate; 21. Mounting frame; 22. Measuring ring; 3. Foil mounting plate; 4. Radial static pressure bearing; 5. Test shaft; 6. Annular gravity block; 601. Pressing nut; 7. Cable; 8. Telescopic rod; 81. Guide wheel; 9. Magnet; 10. Electromagnet; 20. Base plate. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0029] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0030] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complex.

[0031] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples. However, one skilled in the art will appreciate that the aspects described can be practiced without these specific details.

[0032] An embodiment of the present application provides an elastic foil aerodynamic thrust bearing performance testing bench.

[0033] like Figures 1 to 3 As shown, an elastic foil aerodynamic thrust bearing performance test bench includes a workbench 11, a driving member 1, a thrust plate 2, a test shaft 5, a radial hydrostatic bearing 4, a foil mounting plate 3, a loading component, an impact simulation component and a measurement component.

[0034] The driving member 1 is fixed on a workbench 11, which is a marble table. The thrust plate 2 is horizontally installed on the output end of the driving member 1; the radial hydrostatic bearing 4 is installed on the base plate 20 of the workbench 11, and the test shaft 5 is installed in the radial hydrostatic bearing 4. Both ends of the test shaft 5 extend out of the radial hydrostatic bearing 4, and the bottom end of the test shaft 5 is connected to the foil mounting plate 3. The test shaft 5 is connected to the impact simulation assembly, the loading assembly is fixed on the test shaft 5, and the measuring assembly is installed on the workbench 11.

[0035] Among them, the thrust plate 2, test shaft 5, radial static pressure bearing 4 and foil mounting plate 3 are coaxially arranged, the loading component provides a variable loading force for the test shaft 5, the impact simulation component controls the test shaft 5 to accelerate toward the thrust plate 2, and the measuring component measures the status of the thrust plate 2 and the foil mounting plate 3.

[0036] The driving element 1 of the present application is a motor, the output shaft of which is connected to the thrust plate 2. When the motor is started, the motor drives the thrust plate 2 to rotate. The present application adopts a method in which the thrust plate 2 moves and the foil is stationary. The motor drives the thrust plate 2, providing a relative speed between the thrust plate 2 and the foil mounting plate 3 of 0 to 90,000 rpm, generating a load-bearing air film between the thrust plate 2 and the foil mounting plate 3. By controlling the speed of the motor, the floating speed can be changed.

[0037] The radial hydrostatic bearing 4 is mounted on the workbench 11 via a mounting bracket 21. This application restricts radial (horizontal, front-to-back) movement and significant tilting by the radial hydrostatic bearing 4. Only vertical movement of the test shaft 5 is permitted. An external air source lubricates the test shaft 5 and the radial hydrostatic bearing 4, reducing friction during vertical movement.

[0038] The measurement assembly of this embodiment of the present application can include a displacement sensor 15, a temperature sensor 16, and a speed sensor 17. These sensors 15, 16, and 17 respectively measure the dynamic and static distances between the thrust plate 2 and the foil mounting plate 3, the air film airflow temperature, and the relative speed. Displacement sensor 15 utilizes an eddy current sensor, a non-contact sensor. Three evenly spaced circumferences of the sensor measure the distance between the end face of the foil mounting plate 3 and the end face of the thrust plate 2, as well as the pitch and tilt angles.

[0039] The measuring assembly also includes a measuring ring 22 , which surrounds the outer circumference of the thrust plate 2 and is fixed to the workbench 11 via a bracket. The upper end surface of the measuring ring 22 is parallel to the upper end surface of the thrust plate 2 , and each sensor is mounted on the measuring ring 22 .

[0040] The loading assembly includes annular weight blocks 6 of various quality specifications. At least one annular weight block 6 is fixedly mounted on the test shaft 5. The annular weight block 6 surrounds the outer periphery of the test shaft 5 above the radial hydrostatic bearing 4. A radially protruding protrusion is provided on the outer periphery of the test shaft 5 above the radial hydrostatic bearing 4. The test shaft 5 is configured as a stepped shaft, which is thinner at the top and thicker at the bottom. A protrusion is formed at the step. The bottom end face of the annular weight block 6 abuts against the protrusion. The loading assembly also includes a clamping nut 601. The clamping nut 601 is located above the annular weight block 6. The clamping nut 601 is threadedly connected to the test shaft 5 to clamp the annular weight block 6 against the protrusion. The annular weight block 6 is a standard weight for precision machining and measurement and can be converted into standard gravity. Installing different annular weight blocks 6 can change the loading force.

[0041] The impact simulation component causes the test shaft 5 and the foil mounting plate 3 to accelerate toward the thrust plate 2, simulating the impact disturbance of the thrust bearing during operation, thereby detecting the response process of the thrust bearing after the impact disturbance.

[0042] like Figure 1 and Figure 5As shown, the impact simulation assembly includes a control assembly and a cable 7 connected to the top end of the test shaft 5. The other end of the cable 7 extends vertically upward and is connected to the control assembly. The control assembly controls the rise or fall of the test shaft 5 by tightening or loosening the cable 7. When the control assembly tightens or loosens the cable 7, the test shaft 5 begins to fall and descends in a free fall manner.

[0043] The control component includes a gantry bracket 12, multiple guide wheels 81, an electromagnet 10 and a magnet 9. The gantry bracket 12 is fixed on the workbench 11 through the base plate 20. The magnet 9 is connected to the other end of the cable 7. The electromagnet 10 is installed on the outside of the side frame of the gantry bracket 12. Multiple guide wheels 81 are installed parallel to each other on the top frame of the gantry bracket 12. The cable 7 extends vertically upward and then turns through the first guide wheel 81. After passing through other guide wheels 81, it extends to the edge of the top frame of the gantry bracket 12 and then extends downward until the magnet 9 contacts the electromagnet 10. The electromagnet 10 is a disc electromagnet. Three guide wheels 81 are provided. The first guide wheel 81 is provided on the square of the test shaft 5. It should be noted that the "directly above" refers to the first guide wheel so that it can fit the cable 7 extending vertically upward. The second guide wheel 81 is provided on one side of the edge position of the portal bracket 12. One side edge of the second guide wheel 81 protrudes from the portal bracket 12. The third guide wheel 81 is provided between the first guide wheel 81 and the second guide wheel 81. The cable 7 extending vertically upward from the test shaft 5 passes through the first guide wheel 81, the third guide wheel 81 and the second guide wheel 81 in sequence, and then turns downward from the outer edge of the third guide wheel 81.

[0044] When not activated, the disc electromagnet 10 attracts the magnet 9, the cable 7 is tightened, and the test shaft 5 and the foil mounting plate 3 are pulled by the traction cable 7, maintaining a vertical distance from the thrust plate 2. At the moment of activation, the disc electromagnet 10 stops attracting the magnet 9, the cable 7 is relaxed, and the test shaft 5 and the foil mounting plate 3 fall freely, simulating the impact disturbance during the operation of the thrust bearing.

[0045] The control assembly also includes a telescopic rod 8, through which at least one guide wheel 81 is mounted on the gantry support 12. The telescopic rod 8 extends and retracts, driving the guide wheel 81 mounted on the telescopic rod 8 to move vertically. In the embodiment of the present application, the third middle guide wheel 81 is connected to the gantry support 12 via the telescopic rod 8, and the telescopic rod 8 extends and retracts vertically. In other embodiments, the telescopic rod 8 can also be tilted. By adjusting the length of the telescopic rod 8, the distance between the thrust plate 2 and the foil mounting plate 3 can be adjusted, and the impact velocity of the foil mounting plate 3 can be adjusted to simulate different degrees of collision.

[0046] like Figure 3 and Figure 4 As shown, the measurement assembly further includes a torsion bar 18 and a torsion measurement mechanism 19. The torsion measurement mechanism 19 includes a U-shaped turn pin 1904, a connecting rod 1908, an adjustment sleeve 1903, a torque sensor 1901, a fixing bracket 1902, a support bracket 1905, and a counterweight assembly. The support bracket 1905 is fixed to the workbench 11 and is provided with a horizontal through-hole. The connecting rod 1908 is horizontally arranged and passes through the through-hole. The connecting rod 1908 slides in the through-hole along the axial direction of the connecting rod 1908. One end of the connecting rod 1908 is connected to the torque sensor 1901 through the adjustment sleeve 1903. The torque sensor 1901 is mounted on the workbench 11 through the fixing bracket 1902. The other end of the connecting rod 1908 is connected to the counterweight assembly. The U-shaped rotating pin 1904 is rotatably mounted on the connecting rod 1908. The axial direction of the U-shaped rotating pin 1904 is perpendicular to the axial direction of the connecting rod 1908. One end of the torsion bar 18 is connected to the side surface of the foil mounting disk 3, and the torsion bar 18 extends along the radial direction of the foil mounting disk 3. The torsion bar 18 is placed in the strip groove of the U-shaped rotating pin 1904.

[0047] The counterweight assembly includes a counterweight rope 1907, a counterweight block 1909, and a guide wheel assembly 1906. The connecting rod 1908 is connected to one end of the counterweight rope 1907. The counterweight rope 1907 extends along the axis of the connecting rod 1908, passes through the guide wheel assembly 1906, and then turns upward and downward. The other end of the counterweight rope 1907 is connected to the counterweight block 1909. The guide wheel assembly 1906 includes a guide wheel directly facing the connecting rod 1908 and a second guide wheel located above the first guide wheel. The second guide wheel is located on the side of the first guide wheel away from the connecting rod 1908. Two sets of torsion bars 18 and torque measurement mechanisms 19 are provided, one on each circumferentially opposite side of the foil mounting disk 3.

[0048] A torsion bar 18 is symmetrically mounted along the radial direction of the foil mounting disk 3 at the edge of the foil mounting disk 3 . The torsion bar 18 is connected to a rotatable U-shaped turning pin 1904 to dynamically and real-time detect the torque applied to the foil mounting disk 3 .

[0049] In one embodiment, when the motor is not started, the disk electromagnet 10 is disconnected from the magnet 9, so that the foil mounting plate 3 contacts the thrust plate 2. At this time, the test shaft 5 is loaded with a gravity F, the bearing foil on the foil mounting plate 3 is compressed, and the displacement sensor 15 measures the compression amount x. The static stiffness of the bearing foil is k = F / x.

[0050] In another embodiment, the adsorption of the magnetic magnet 9 by the disc electromagnet 10 is adjusted by adjusting the length of the telescopic rod 8 and the distance between the foil mounting plate 3 and the thrust plate 2. After starting the motor, the adsorption of the magnetic magnet 9 by the disc electromagnet 10 is disconnected, and the displacement sensor 15 and the torque sensor 1901 measure the process of the foil mounting plate 3 falling, oscillating to stable floating under the corresponding loaded gravity.

[0051] The above two measurement methods are used to test the static and dynamic performance of elastic foil type aerodynamic thrust bearings.

[0052] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An elastic foil air dynamic thrust bearing performance test bench, characterized in that: Includes a workbench, drive member, thrust plate, test shaft, radial hydrostatic bearing, foil mounting plate, loading assembly, impact simulation assembly and measurement assembly; The driving member is fixed on the workbench, the thrust plate is horizontally installed on the output end of the driving member, and the driving member drives the thrust plate to rotate; the radial static pressure bearing is fixedly installed on the workbench, the test shaft is installed in the radial static pressure bearing, both ends of the test shaft extend out of the radial static pressure bearing, the bottom end of the test shaft is connected to the foil mounting plate, the test shaft is connected to the impact simulation component, the loading component is fixed on the test shaft, and the measuring component is installed on the workbench; The thrust plate, the test shaft, the radial static pressure bearing and the foil mounting plate are coaxially arranged, the loading assembly provides a variable loading force for the test shaft, the impact simulation assembly controls the test shaft to accelerate toward the thrust plate, and the measuring assembly measures the states of the thrust plate and the foil mounting plate; The impact simulation component includes a control component and a cable connected to the top of the test shaft, the other end of the cable extends vertically upward and is connected to the control component, and the control component controls the rise or fall of the test shaft by tightening or loosening the cable; The control component includes a gantry, a plurality of guide wheels, an electromagnet and a magnet. The gantry is installed on the workbench, the magnet is connected to the other end of the cable, the electromagnet is installed on the outside of the side frame of the gantry, and a plurality of guide wheels are installed parallel to each other on the top frame of the gantry. The cable extends vertically upward, turns through the first guide wheel, passes through the other guide wheels, extends to the edge of the top frame of the gantry, and then extends downward until the magnet contacts the electromagnet.

2. The elastic foil air dynamic thrust bearing performance testing bench according to claim 1 is characterized in that: The loading assembly includes annular gravity blocks of various mass specifications. At least one of the annular gravity blocks is fixedly mounted on the test shaft, and the annular gravity blocks surround the outer circumference of the test shaft above the radial static pressure bearing.

3. The elastic foil air dynamic thrust bearing performance testing bench according to claim 2 is characterized in that: A radially protruding protrusion is provided on the outer periphery of the test shaft above the radial static pressure bearing, and the bottom end surface of the annular gravity block abuts against the protrusion. The loading assembly also includes a clamping nut, which is located above the annular gravity block. The clamping nut presses the annular gravity block onto the protrusion by being threadedly connected to the test shaft.

4. The elastic foil air dynamic thrust bearing performance testing bench according to claim 1 is characterized in that: The control assembly also includes a telescopic rod, and at least one of the guide wheels is installed on the portal bracket through the telescopic rod. The telescopic rod is extended and retracted to drive the guide wheel installed on the telescopic rod to move in the vertical direction.

5. The elastic foil air dynamic thrust bearing performance testing bench according to claim 1 is characterized in that: The measuring assembly comprises a measuring ring, which surrounds the outer circumference of the thrust plate and is fixed on the workbench. A sensor is installed on the measuring ring.

6. The elastic foil air dynamic thrust bearing performance testing bench according to claim 1 is characterized in that: The measuring assembly includes a torsion bar and a torsion measuring mechanism, and the torsion measuring mechanism includes a support frame, a U-shaped swivel pin, a connecting rod, a torque sensor and a counterweight assembly. The support frame is fixed on the workbench, and the connecting rod is horizontally and slidably installed on the support frame along the axial direction. One end of the connecting rod is connected to the torque sensor, and the torque sensor is fixed on the workbench. The other end of the connecting rod is connected to the counterweight assembly. The U-shaped swivel pin is installed on the connecting rod, and the axial direction of the U-shaped swivel pin is perpendicular to the axial direction of the connecting rod. One end of the torsion bar is connected to the side of the foil mounting disk, and the torsion bar extends along the radial direction of the foil mounting disk. The torsion bar is placed in the strip groove of the U-shaped swivel pin.

7. The elastic foil air dynamic thrust bearing performance testing bench according to claim 6 is characterized in that: The support frame is provided with a horizontal through hole, the connecting rod passes through the through hole, the connecting rod slides in the through hole, the counterweight assembly includes a counterweight rope, a counterweight block and a guide wheel assembly, one end of the connecting rod is connected to the torque sensor through an adjustment sleeve, the other end of the connecting rod is connected to one end of the counterweight rope, the counterweight rope extends along the axis direction of the connecting rod through the guide wheel assembly, first turns upward and then downward, and the other end of the counterweight rope is connected to the counterweight block.

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