Oil damper test bed

Abstract

The utility model relates to an oil damper test bench, which belongs to the technical field of damper test equipment and comprises a power transmission assembly, a displacement beam, a guide rail, a first clamp assembly, a second clamp assembly, a crank and a lifter. Wherein the power transmission assembly is provided with a driving shaft; the displacement cross beam is connected with the driving shaft; the guide rail is installed on the side, away from the driving shaft, of the displacement cross beam and installed in the length direction of the displacement cross beam. The first clamp assembly and the second clamp assembly are installed at the two ends of the guide rail correspondingly, connected with the guide rail in a sliding mode and used for fixing the shock absorber. One end of the crank is eccentrically connected with the driving shaft, the other end of the crank is fixedly connected with the first clamp assembly, and the crank drives the first clamp assembly to rotate along with rotation of the driving shaft. The lifter is installed at the end, close to the second clamp assembly, of the displacement cross beam, and an output shaft of the lifter is connected with the second clamp assembly. According to the oil damper test bed, the angle change of the damper can be realized more quickly and accurately.

Description

Technical Field

[0001] This utility model belongs to the technical field of vibration damper testing equipment, and in particular relates to a hydraulic vibration damper testing bench. Background Technology

[0002] Vibration damper testing equipment is an important tool for measuring the performance of vibration dampers and a crucial testing device for evaluating their durability and reliability.

[0003] Traditional vibration damper testing equipment has non-adjustable clamp sizes. For different models of vibration dampers, the corresponding clamps must be changed during testing. This not only increases the complexity of operation but may also lead to errors and inconsistencies during the testing process. Furthermore, the angle change of the vibration damper is usually achieved by a hydraulic cylinder, which is not flexible enough. Especially when the angle needs to be adjusted frequently, the response speed and accuracy of the hydraulic cylinder often cannot meet the requirements.

[0004] Therefore, how to provide a flexible, universal and easy-to-operate vibration damper testing device is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic vibration damper test bench. The hydraulic vibration damper test bench in this embodiment features an innovative design that uses a crank to drive the clamp to rotate, which is more flexible and precise than the traditional hydraulic cylinder method, meets the requirements for high-frequency angle adjustment, and improves testing efficiency.

[0006] This utility model provides a hydraulic vibration damper test bench, comprising:

[0007] The power transmission assembly has a drive shaft for providing and transmitting power;

[0008] The displacement beam is connected to the drive shaft;

[0009] The guide rail is installed on the side of the displacement beam away from the drive shaft and along the length of the displacement beam.

[0010] The first clamp assembly is mounted on the first end of the guide rail and is slidably connected to the guide rail to fix one end of the shock absorber.

[0011] The second clamp assembly is mounted on the second end of the guide rail and is slidably connected to the guide rail to fix the other end of the shock absorber.

[0012] The crank has one end eccentrically connected to the drive shaft and the other end fixedly connected to the first clamp assembly. The crank rotates with the rotation of the drive shaft, causing the first clamp assembly to rotate.

[0013] The lifting platform is installed at one end of the displacement beam near the second clamp assembly. The output shaft of the lifting platform is connected to the second clamp assembly and is used to drive the second clamp assembly to slide along the guide rail.

[0014] The hydraulic damper test bench in this embodiment of the technical solution features an innovative design that uses a crank to drive the clamp to rotate, which is more flexible and precise than the traditional hydraulic cylinder method, meets the requirements for high-frequency angle adjustment, and improves testing efficiency.

[0015] In some embodiments, both the first clamp assembly and the second clamp assembly employ adjustable clamps with adjustable opening and closing sizes. The adjustable clamps are equipped with clamp seats for installation, and the adjustable clamps are slidably connected to the guide rails via the clamp seats. This technical solution, through the adjustable clamps, allows for flexible adjustment of the opening and closing size according to the specific dimensions of the shock absorber, ensuring a secure and precise fixation for different shock absorbers.

[0016] In some embodiments, the adjustable clamp includes a gripper base and a gripper. The gripper base is fixed to the clamping base, and the side of the gripper base facing the shock absorber is arc-shaped. The gripper is installed inside the arc-shaped gripper base and extends out of both ends of the arc-shaped gripper base. This technical solution, through the arc-shaped gripper base, can better conform to the outer contour of the shock absorber, making the contact between the gripper and the shock absorber tighter and more uniform.

[0017] In some embodiments, a hydraulic cylinder is provided at the end of the gripper base away from the vibration damper. The output shaft of the hydraulic cylinder is connected to a push rod, which extends into the gripper base and connects to the center of the gripper. The hydraulic cylinder is used to adjust the length of the push rod to adjust the opening and closing size of the gripper. This technical solution achieves precise control of the gripper's opening and closing by using a hydraulic cylinder to drive the push rod to adjust the opening and closing size of the gripper.

[0018] In some embodiments, the gripper includes multiple chain links connected end-to-end, with adjacent chain links hinged to each other, and a top rod connected to a central chain link. This technical solution allows for more flexible adjustment of the opening size.

[0019] In some embodiments, the hydraulic damper test bench further includes a slewing assembly, the displacement slewing assembly comprising:

[0020] A crossbeam adapter plate is sleeved on the outer periphery of the drive shaft and fixedly connected to the center of the displacement crossbeam, used to drive the displacement crossbeam to rotate.

[0021] A rotary actuator, mounted on one side of the crossbeam adapter plate, provides rotational power to the plate. This technical solution precisely controls the rotation of the crossbeam adapter plate via the rotary actuator, enabling accurate adjustment of the damper angle to meet various testing requirements.

[0022] In some embodiments, a fixing block is provided at the connection between the drive shaft and the crank to secure the crank. The fixing block ensures a firm and reliable connection between the crank and the drive shaft, preventing the crank from loosening or shifting during drive shaft rotation.

[0023] In some embodiments, a connecting shaft is provided at the connection between the crank and the first clamp assembly, and the crank is hinged to the first clamp assembly via the connecting shaft. This technical solution, through the provision of the connecting shaft, ensures the smoothness and accuracy of the first clamp assembly during movement, enabling the shock absorber to move and be tested in a predetermined manner.

[0024] In some embodiments, the output shaft of the elevator is connected to a lead screw, which is used to connect to the second clamping assembly. This technical solution can accurately transmit the linear motion of the elevator to the second clamping assembly, thereby achieving precise adjustment of the position of the second clamping assembly.

[0025] In some embodiments, the hydraulic damper test bench also includes a base, with a fixed cover mounted on top of the base. The power transmission assembly is installed inside the fixed cover, and the drive shaft extends out of the fixed cover and connects to the displacement beam. This technical solution, through the base and fixed cover, provides a stable support foundation for the entire test bench, while protecting the power transmission assembly, reducing its wear and the probability of failure, and extending the service life of the equipment.

[0026] Based on the above solution, the hydraulic vibration damper test bench in this embodiment of the invention uses a crank that is eccentrically connected to the drive shaft at one end and fixedly connected to the first clamp assembly at the other end. The crank rotates with the drive shaft, driving the first clamp assembly to rotate. Compared to the traditional method of changing the damper angle using a hydraulic cylinder, this structure offers greater operational flexibility. Especially when frequent angle adjustments are required, it enables faster and more precise angle changes, overcoming the limitations of insufficient hydraulic cylinder response speed and precision. This meets the high-precision requirements for damper angle adjustment and improves the testing performance and efficiency of the test bench. A lifting platform is installed at the end of the displacement beam near the second clamp assembly, with its output shaft connected to the second clamp assembly to drive it to slide along the guide rail. This allows for convenient and precise control of the second clamp assembly's position during damper installation and adjustment, further improving adaptability to different dampers and ease of operation. In summary, the hydraulic damper test bench in this embodiment features an innovative design that uses a crank to drive the clamp rotation, which is more flexible and precise than the traditional hydraulic cylinder method, meeting the requirements for high-frequency angle adjustment and improving testing efficiency. In addition, the stable power transmission and adjustable clamp position not only ensure the stable operation of the test bench but also further enhance its adaptability to various types of dampers, greatly improving the ease of operation. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is an isometric view of the hydraulic vibration damper test bench of this utility model;

[0029] Figure 2 This is a side view of the hydraulic vibration damper test bench of this utility model;

[0030] Figure 3 For along Figure 2 Sectional view of line AA in the middle;

[0031] Figure 4 This is a front view of the hydraulic vibration damper test bench of this utility model;

[0032] Figure 5 For along Figure 4 Sectional view of the middle BB line;

[0033] Figure 6 This is a schematic diagram of the adjustable fixture in the hydraulic vibration damper test bench according to an embodiment of this utility model;

[0034] Figure 7 This is a cross-sectional view of the adjustable fixture in the hydraulic damper test bench according to an embodiment of this utility model.

[0035] In the picture:

[0036] 1. Power transmission assembly; 2. Displacement beam; 3. Guide rail; 4. First clamp assembly; 5. Second clamp assembly; 6. Adjustable clamp; 7. Crank; 8. Lift; 9. Slewing assembly; 10. Shock absorber; 11. Base; 12. Fixed cover;

[0037] 101. Servo motor reducer unit; 102. Drive shaft;

[0038] 601. Clamp base; 602. Gripper base; 603. Gripper; 6031. Chain rod; 604. Hydraulic cylinder; 605. Push rod;

[0039] 701. Fixing block; 702. Connecting shaft;

[0040] 801, Lead screw; 901, Crossbeam adapter plate; 902, Rotary drive. Detailed Implementation

[0041] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] like Figures 1-7As shown, in one embodiment of the hydraulic vibration damper test bench of this utility model, the hydraulic vibration damper test bench includes a power transmission assembly 1, a displacement beam 2, a guide rail 3, a first clamp assembly 4, a second clamp assembly 5, a crank 7, and a lift 8; wherein, the power transmission assembly 1 is provided with a drive shaft 102 for providing and transmitting power; the displacement beam 2 is connected to the drive shaft 102; the guide rail 3 is installed on the side of the displacement beam 2 away from the drive shaft 102 and is installed along the length direction of the displacement beam 2; the first clamp assembly 4 is installed at the first end of the guide rail 3 and is connected to the first end of the guide rail 3. The guide rail 3 is slidably connected to fix one end of the shock absorber 10; the second clamp assembly 5 is installed on the second end of the guide rail 3 and is slidably connected to the guide rail 3 to fix the other end of the shock absorber 10; one end of the crank 7 is eccentrically connected to the drive shaft 102, and the other end is fixedly connected to the first clamp assembly 4. The crank 7 rotates with the rotation of the drive shaft 102, causing the first clamp assembly 4 to rotate; the elevator 8 is installed on the displacement beam 2 near the end of the second clamp assembly 5. The output shaft of the elevator 8 is connected to the second clamp assembly 5 to drive the second clamp assembly 5 to slide along the guide rail 3.

[0046] In the above illustrative embodiment, the hydraulic damper test bench is eccentrically connected to the drive shaft 102 at one end of the crank 7 and fixedly connected to the first clamp assembly 4 at the other end. The crank 7 rotates with the drive shaft 102, driving the first clamp assembly 4 to rotate. Compared to the traditional method of changing the angle of the damper 10 using a hydraulic cylinder 604, this structure offers greater operational flexibility. Especially when frequent angle adjustments are required, it enables faster and more precise angle changes for the damper 10, overcoming the limitations of the hydraulic cylinder 604's response speed and accuracy. This meets the high-precision requirements for adjusting the angle of the damper 10, improving the test bench's performance and efficiency. The lifting platform 8 is installed at the end of the displacement beam 2 near the second clamp assembly 5, and its output shaft is connected to the second clamp assembly 5, driving the second clamp assembly 5 to slide along the guide rail 3. This allows for convenient and precise control of the position of the second clamp assembly 5 during the installation and adjustment of the damper 10, further improving the adaptability to different dampers 10 and the ease of operation. In summary, the innovative design of the hydraulic damper test bench in this embodiment, which uses crank 7 to drive the clamp rotation, is more flexible and precise than the traditional hydraulic cylinder 604 method, meeting the requirements for high-frequency angle adjustment and improving testing efficiency. In addition, the stable power transmission and adjustable clamp position not only ensure the stable operation of the test bench, but also further enhance the adaptability to various types of dampers 10, greatly improving the ease of operation.

[0047] In some embodiments, such as Figure 6As shown, both the first clamp assembly 4 and the second clamp assembly 5 employ adjustable clamps 6 with adjustable opening and closing sizes. The adjustable clamp 6 is equipped with a clamp seat 601 for installation, and the adjustable clamp 6 is slidably connected to the guide rail 3 via the clamp seat 601. By using the adjustable clamp 6, the opening and closing size can be flexibly adjusted according to the specific dimensions of the shock absorber 10, ensuring a firm and precise fixation for different shock absorbers 10.

[0048] Furthermore, such as Figure 6 As shown, the adjustable clamp 6 includes a gripper base 602 and a gripper 603. The gripper base 602 is fixed to the clamp base 601. The side of the gripper base 602 facing the vibration damper 10 is arc-shaped. The gripper 603 is installed inside the arc-shaped gripper base 602 and extends out from both ends of the arc-shaped gripper base 602. The arc-shaped gripper base 602 design can better fit the outer contour of the vibration damper 10, making the contact between the gripper 603 and the vibration damper 10 tighter and more uniform. This not only improves the fixing effect of the vibration damper 10, preventing the vibration damper 10 from shifting or shaking during the test, ensuring the accuracy and stability of the test, but also the arc-shaped structure can disperse the fixing force, reduce the local pressure on the surface of the vibration damper 10, and avoid damage to the vibration damper 10.

[0049] In some embodiments, such as Figure 6 As shown, a hydraulic cylinder 604 is also provided at the end of the gripper base 602 away from the vibration damper 10. The output shaft of the hydraulic cylinder 604 is connected to a push rod 605. The push rod 605 extends into the gripper base 602 and is connected to the center of the gripper 603. The hydraulic cylinder 604 is used to adjust the length of the push rod 605 to adjust the opening and closing size of the gripper 603. By driving the push rod 605 with the hydraulic cylinder 604 to adjust the opening and closing size of the gripper 603, precise control of the opening and closing of the gripper 603 is achieved. Its automated adjustment method is simple and quick to operate, and can quickly and accurately adjust the opening and closing degree of the gripper 603 according to the size of different vibration dampers 10, improving work efficiency. At the same time, the driving force of the hydraulic cylinder 604 is stable, which can ensure that the clamping force of the gripper 603 is consistent when fixing the vibration damper 10, further improving the reliability of the test.

[0050] In some embodiments, such as Figure 7 As shown, the gripper 603 includes multiple chain rods 6031 connected end to end, with adjacent chain rods 6031 hinged together. The top rod 605 is connected to the chain rod 6031 at the center. The gripper 603 structure, composed of multiple hinged chain rods 6031, has good flexibility and adaptability, allowing for more flexible adjustment of the opening size. Furthermore, the chain rod 6031 structure can evenly transmit force when adjusting the opening and closing size, ensuring that each part of the gripper 603 can apply appropriate pressure to the vibration damper 10, guaranteeing the stability and reliability of the fixation, while also reducing the risk of damage to the vibration damper 10 due to uneven local force.

[0051] In some embodiments, such as Figure 1 As shown, the hydraulic vibration damper test bench also includes a slewing assembly 9, which comprises a crossbeam adapter plate 901 and a slewing driver 902. The crossbeam adapter plate 901 is sleeved on the outer periphery of the drive shaft 102 and fixedly connected to the center of the displacement crossbeam 2, used to drive the displacement crossbeam 2 to rotate. The slewing driver 902 is installed on one side of the crossbeam adapter plate 901, used to provide rotational power to the crossbeam adapter plate 901. The slewing assembly 9 adds a slewing function to the test bench, enabling the displacement crossbeam 2 to rotate, thereby driving the vibration damper 10 to rotate. This allows the vibration damper 10 to be in different angles and positions during testing, simulating more complex actual working conditions and improving the comprehensiveness and accuracy of the test bench's performance testing of the vibration damper 10. By precisely controlling the rotation of the crossbeam adapter plate 901 through the slewing driver 902, the angle of the vibration damper 10 can be precisely adjusted to meet different testing requirements.

[0052] In some embodiments, such as Figure 5 As shown, a fixing block 701 for fixing the crank 7 is provided at the connection between the drive shaft 102 and the crank 7. The fixing block 701 ensures that the connection between the crank 7 and the drive shaft 102 is firm and reliable, preventing the crank 7 from loosening or displacing during the rotation of the drive shaft 102.

[0053] In some embodiments, such as Figure 3 As shown, a connecting shaft 702 is provided at the connection between the crank 7 and the first clamp assembly 4, and the crank 7 is hinged to the first clamp assembly 4 through the connecting shaft 702. The setting of the connecting shaft 702 ensures the smoothness and accuracy of the first clamp assembly 4 during the movement process, so that the shock absorber 10 can move and be tested in a predetermined manner.

[0054] In some embodiments, such as Figure 2 As shown, the output shaft of the lifting platform 8 is connected to a lead screw 801, which is used to connect to the second clamping assembly 5. The use of the lead screw 801 enables the linear motion of the lifting platform 8 to be accurately transmitted to the second clamping assembly 5, thereby achieving precise adjustment of the position of the second clamping assembly 5.

[0055] In some embodiments, the elevator 8 is a nut screw jack.

[0056] In some embodiments, such as Figure 4As shown, the hydraulic vibration damper test bench also includes a base 11, with a fixed cover 12 mounted on top of the base 11. The power transmission assembly 1 is installed inside the fixed cover 12, and the drive shaft 102 extends out of the fixed cover 12 and connects to the displacement beam 2. The base 11 provides a stable support foundation for the entire test bench, ensuring its stability during operation. The fixed cover 12 protects the power transmission assembly 1, preventing dust, debris, and other contaminants from entering the assembly, reducing wear and the probability of malfunctions, and extending the equipment's service life. Simultaneously, the fixed cover 12 also provides a certain degree of safety protection, preventing operators from accidentally contacting dangerous components of the power transmission assembly 1, thus improving the safety of the test bench.

[0057] In some embodiments, such as Figure 5 As shown, the power transmission assembly 1 also includes a servo motor reducer 101, which is connected to the drive shaft 102.

[0058] Through the description of several embodiments of the hydraulic vibration damper test bench of this utility model, it can be seen that the embodiments of the hydraulic vibration damper test bench of this utility model have at least one or more of the following advantages:

[0059] 1. The hydraulic damper test bench provided by this utility model is connected eccentrically to the drive shaft 102 at one end of the crank 7 and fixedly connected to the first clamp assembly 4 at the other end. The crank 7 drives the first clamp assembly 4 to rotate with the rotation of the drive shaft 102. Compared with the traditional method of changing the angle of the damper 10 through the hydraulic cylinder 604, this structure is more flexible in operation.

[0060] 2. The hydraulic damper test bench provided by this utility model, through the setting of adjustable clamp 6, can flexibly adjust the opening and closing size according to the specific size of the damper 10, so as to ensure that different dampers 10 can be firmly and accurately fixed.

[0061] 3. The hydraulic damper test bench provided by this utility model adds a rotation function to the test bench through the setting of the slewing assembly 9, which enables the displacement beam 2 to rotate and thus drive the damper 10 to rotate, so that the damper 10 can be in different angles and positions during the test, simulating more complex actual working conditions, and improving the comprehensiveness and accuracy of the test bench for the performance test of the damper 10.

[0062] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0063] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. Test bench for oil hydraulic shock absorbers, characterized in that The utility model relates to a hydraulic shock absorber test bench, which comprises the following: a power transmission assembly provided with a driving shaft for providing and transmitting power; a displacement beam connected with the driving shaft; a guide rail mounted on the displacement beam away from the driving shaft and along the length direction of the displacement beam; a first clamp assembly mounted on the first end of the guide rail and in sliding connection with the guide rail for fixing one end of the shock absorber; a second clamp assembly mounted on the second end of the guide rail and in sliding connection with the guide rail for fixing the other end of the shock absorber; a crank in eccentric connection with the driving shaft at one end and fixedly connected with the first clamp assembly at the other end, the crank driving the first clamp assembly to rotate with the rotation of the driving shaft; a lifting machine mounted on the displacement beam close to the second clamp assembly, the output shaft of the lifting machine being connected with the second clamp assembly for driving the second clamp assembly to slide along the guide rail.

2. The oil damper test bench according to claim 1, characterized in that Both the first clamp assembly and the second clamp assembly adopt an adjustable clamp with adjustable opening and closing size, the adjustable clamp being provided with a clamp seat for mounting, and the adjustable clamp being in sliding connection with the guide rail through the clamp seat.

3. The oil damper test bench according to claim 2, characterized in that The adjustable clamp comprises a gripper seat and a gripper, the gripper seat being fixed on the clamp seat, the side of the gripper seat facing the shock absorber being arc-shaped, and the gripper being installed inside the arc-shaped gripper seat and extending out of both ends of the arc-shaped gripper seat.

4. The oil damper test bench according to claim 3, characterized in that The end of the gripper seat away from the shock absorber is further provided with an oil cylinder, the output shaft of the oil cylinder being connected with a jack rod, the jack rod extending into the gripper seat and being connected with the center of the gripper, and the oil cylinder being used for adjusting the length of the jack rod to adjust the opening and closing size of the gripper.

5. The oil damper test bench of claim 4, wherein The gripper comprises a plurality of chain links connected head to tail, adjacent chain links being hingedly connected with each other, and the jack rod being connected with the chain link at the center.

6. The oil hydraulic shock absorber test bench according to claim 1, characterized in that The hydraulic shock absorber test bench further comprises a rotation assembly, the displacement rotation assembly comprising: a beam adapter plate sleeved on the outer periphery of the driving shaft and fixedly connected with the center of the displacement beam for driving the displacement beam to rotate; a rotation driver mounted on one side of the beam adapter plate for providing rotary power for the beam adapter plate.

7. The oil hydraulic shock absorber test bench according to claim 1, characterized in that The connection between the driving shaft and the crank is provided with a fixing block for fixing the crank.

8. The oil hydraulic shock absorber test bench according to claim 1, characterized in that The connection between the crank and the first clamp assembly is provided with a connecting shaft, the crank being hingedly connected with the first clamp assembly through the connecting shaft.

9. The oil hydraulic shock absorber test bench according to claim 1, characterized in that The output shaft of the lifting machine is connected with a lead screw, the lead screw being used for connecting the second clamp assembly.

10. The oil hydraulic shock absorber test bench according to claim 1, characterized in that The hydraulic shock absorber test bench is further provided with a base, a fixed cover being mounted above the base, the power transmission assembly being installed in the fixed cover, and the driving shaft extending out of the fixed cover and being connected with the displacement beam.

Images