A speed generating device

Abstract

The present invention discloses a speed generating device, comprising a table body and two handles on the outer wall of the table body. The table body is provided with a driving system installed inside the table body. The output shaft of the driving system is connected to a precision shaft system through a coupling. A work table is installed on the end of the precision shaft system. The precision shaft system is used to transmit the driving force of the driving system to the work table surface. The object to be measured is installed on the work table surface. The driving system can provide linear velocity, angular velocity and acceleration for the object to be measured. During operation, the present invention drives the work table surface to rotate through the provided driving system, provides the object to be measured with motion velocity, angular velocity and acceleration, facilitates the simultaneous detection of multiple devices, improves the detection efficiency, adopts a control method of directly driving the work table surface with a high-performance rare earth permanent magnet servo motor, is convenient to control, has a light weight and a small moment of inertia, improves the test rate accuracy, and protects the work table surface through a top cover, improves the detection accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of speed generating devices, and in particular relates to a speed generating device. Background Art

[0002] Currently, most existing speed generators in China use a deceleration-torque-increasing control method. This method uses a motor to control the test bench via a deceleration-torque-increasing mechanism. The test object is mounted on the test bench, providing the test object with a given motion speed. These devices are widely used in speed testing applications. However, their disadvantages include a complex structure, large size, slow control timeliness, large moment of inertia, low test rate control accuracy, and a narrow speed regulation range. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a speed generating device, which effectively solves the problems of low test rate control accuracy and small speed regulation range of the existing speed testing equipment.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a velocity generating device, comprising a platform and two handles on the outer wall of the platform, the platform, and a drive system installed inside the platform, the output shaft of the drive system is connected to the precision shaft system through a coupling, the platform bears the entire weight of the precision shaft system and the load, and directly supports the shaft system through bearings, a work table is installed at the end of the precision shaft system, the precision shaft system is used to transmit the driving force of the drive system to the work table, the object to be measured is installed on the work table, the work table material is 7A04 aluminum alloy, its tensile strength reaches 490MPa, the thermal expansion coefficient is 2.3×10-5 / ℃, it has a small mass and moment of inertia, and the material is non-magnetic, the drive system can provide linear velocity, angular velocity and acceleration for the object to be measured, an angle measurement system is provided inside the drive system, a top cover is installed at one end of the platform, the top cover is used to protect the work table and the object to be measured.

[0005] Preferably, the precision shaft system includes a main shaft and a support system, the two ends of the main shaft are respectively connected to the coupling and the work table, the support system is used to support the main shaft, and the support system consists of a bearing end cover, a bearing seat, two angular contact ball bearings, a locking nut, and inner and outer ring spacers. The angular contact bearings are assembled back to back. This installation method has good bearing rigidity and overturning moment resistance, and will not cause the bearing to get stuck when exposed to heat. The inner and outer ring spacers are used to adjust the clearance of the angular contact bearing so that it can meet the rotational accuracy requirements.

[0006] Preferably, the drive system includes a servo motor and a servo driver. The servo motor has a rated torque of 1.1 Nm, a peak torque of 3.82 Nm, a rated speed of 3500 r / min, and sufficient torque and speed margin. The servo driver uses an IGBT power module with fast switching speed and small voltage drop to form a dual-channel four-quadrant full-bridge circuit, operates in PWM mode, has a small size, light weight, and high efficiency, and the angle measurement system is integrated inside the servo motor and uses a resolver encoder.

[0007] Preferably, the top cover includes an external cover body, an end ring is provided on the side of the external cover body close to the platform body, an internal cover body is installed on one side of the end ring, the external cover body is sleeved on the outside of the internal cover body, a limiting groove is provided on the outer wall of the internal cover body, a suction cup is installed on the inner wall of the external cover body, and the external cover body and the internal cover body for length adjustment are fixed by negative pressure adsorption between the suction cup and the limiting groove, and a positioning mounting part is installed on the side of the end ring close to the platform body.

[0008] Preferably, the end of the suction cup is in close contact with the inner wall of the limiting groove, and a connecting groove is provided inside the external cover body, which is connected to each suction cup. A side tube is installed on the outer wall of the external cover body in communication with the connecting groove, and a piston is movably installed inside the side tube, a screw is installed on the piston, and a screw barrel is installed on the side tube, and the screw and the screw barrel are threadedly connected.

[0009] Preferably, the positioning mounting part includes an end groove opened at an equal angle on the side of the end ring close to the platform body, a positioning cylinder is installed inside the end groove, and a positioning groove is opened at an equal angle on the platform body. During installation, the positioning cylinder is inserted into the positioning groove, and a side groove is opened at an equal angle on the outer wall of the positioning cylinder. A friction plate is movably installed inside the side groove, and a protective sleeve is provided on the outer side of the positioning cylinder. The inner wall of the protective sleeve contacts the outer wall of the friction plate, and the protective sleeve can enter the end groove.

[0010] Preferably, a pressure plate is provided on the side of the friction plate close to the interior of the positioning cylinder, a guide rod is installed on the friction plate, the pressure plate and the guide rod are slidably connected, a first spring is symmetrically installed between the friction plate and the pressure plate, a push rod is movably installed inside the positioning cylinder, a first connecting rod is provided between the push rod and each pressure plate, the two ends of the first connecting rod are hinged to the push rod and the pressure plate respectively, and an adaptive adjustment part is installed between each push rod and the external cover body.

[0011] Preferably, the adaptive adjustment part includes two plate grooves opened inside the end ring, a middle groove is opened between the two plate grooves, a tooth plate is slidably installed inside the plate groove, one tooth plate is fixedly connected to the push rod, and the other tooth plate is fixedly connected to the external cover body, a gear is rotatably installed inside the middle groove, the gear is engaged with the two tooth plates, and a clamping fixing part is provided on the outer side of the tooth plate connected to the external cover body.

[0012] Preferably, the clamping fixing member includes a movable groove, which is opened on the side of the plate groove away from the middle groove where a tooth plate connected to the external cover body is installed, and a rod groove is opened at one end of the movable groove close to the end groove, a clamping plate is installed for longitudinal sliding inside the movable groove, and a cross bar is installed for transverse sliding inside the rod groove, a second connecting rod is provided between the cross bar and the clamping plate, and both ends of the second connecting rod are hinged to the clamping plate and the cross bar respectively, one end of the cross bar is located in the end groove, and a second spring is installed at the other end of the cross bar.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1) During operation, the working table is driven to rotate by the drive system, providing the motion speed, angular velocity and acceleration for the object under test, facilitating the simultaneous detection of multiple devices and improving detection efficiency. The high-performance rare earth permanent magnet servo motor is used to directly drive the working table, which is convenient to control. The working table is light in weight and has a small moment of inertia, which improves the test rate accuracy. The working table is protected by a top cover, which improves the detection accuracy.

[0015] 2) During operation, the outer cover is sleeved on the outer side of the inner cover, and a suction cup is installed on the inner wall of the outer cover. The suction cup and the inner cover are fixed by negative pressure adsorption, which facilitates the adjustment of the length of the top cover, thereby facilitating the protection of work surfaces of different thicknesses. At the same time, the positioning tube is inserted into the positioning groove, and the top cover is installed by friction between the friction plate and the inner wall of the positioning groove, which is convenient for use;

[0016] 3) During operation, when the length of the top cover increases, the push rod moves toward the pressure plate through the two toothed plates and the gear, pushing the pressure plate toward the side of the friction plate, causing the elastic force of the first spring to increase. As the length of the top cover increases, the friction resistance between the friction plate and the inner wall of the positioning groove increases, thereby adaptively improving the installation stability of the top cover and facilitating the protection of the work surface;

[0017] 4) During operation, a protective sleeve is provided on the outer side of the positioning cylinder to prevent the friction plate from moving outward under the action of elastic force, which is convenient for subsequent installation. After installation, the protective sleeve enters the end groove, so that the top cover and the platform body are in close contact, thereby improving the protection effect. After the protective sleeve is pushed into the end groove, the cross bar is pushed to move horizontally, and the second connecting rod pushes the clamping plate to move to tighten the tooth plate, thereby further pressing and fixing the outer cover body and the inner cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached figure:

[0020] Figure 1 This is a schematic structural diagram of a velocity generating device of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the platform of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the support system of the present invention;

[0023] Figure 4 This is a schematic diagram of the external structure of the top cover of the present invention;

[0024] Figure 5 Schematic diagram of the top cover structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the positioning mounting structure of the present invention;

[0026] Figure 7 Schematic diagram of the connection structure between the friction plate and the pressure plate of the present invention;

[0027] Figure 8 For the present invention Figure 6 Enlarged structural diagram at point A in the middle.

[0028] In the figure: 1, platform; 2, handle; 3, top cover; 301, outer cover; 302, end ring; 303, inner cover; 304, limit groove; 305, suction cup; 306, connecting groove; 307, side cylinder; 308, piston; 309, screw; 310, positioning mounting member; 3101, end groove; 3102, positioning cylinder; 3103, side groove; 3104, friction plate; 3105, guide rod; 3106, pressure plate; 3107, first spring; 3108, push rod; 3109, first connecting rod; 31 1. Adaptive adjustment part; 3111. Plate groove; 3112. Middle groove; 3113. Tooth plate; 3114. Gear; 312. Clamping fixture; 3121. Movable groove; 3122. Rod groove; 3123. Clamping plate; 3124. Crossbar; 3125. Second spring; 3126. Second connecting rod; 313. Protective sleeve; 4. Work surface; 5. Precision shafting; 6. Drive system; 7. Angle measurement system; 8. Bearing end cover; 9. Bearing seat; 10. Angular contact ball bearing; 11. Locking nut; 12. Inner and outer ring spacers. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Embodiment 1, by Figure 1-3 The present invention relates to a speed generating device, comprising a platform 1 and two handles 2 on the outer wall of the platform 1, the platform 1, and a driving system 6 installed inside the platform 1. The output shaft of the driving system 6 is connected to the precision shaft system 5 through a coupling, and a work table 4 is installed at the end of the precision shaft system 5. The precision shaft system 5 is used to transmit the driving force of the driving system 6 to the work table 4. The object to be measured is installed on the work table 4. The driving system 6 can provide linear velocity, angular velocity and acceleration for the object to be measured. An angle measuring system 7 is arranged inside the driving system 6. A top cover 3 is installed at one end of the platform 1. The top cover 3 is used to protect the work table 4 and the object to be measured. The precision shaft system 5 includes a main shaft and a support system. The two ends of the main shaft are respectively connected to the coupling and the work table 4. The support system 7 is used to transmit the driving force of the driving system 6 to the work table 4. The bearing system is used to support the main shaft. The supporting system consists of a bearing end cover 8, a bearing seat 9, two angular contact ball bearings 10, a locking nut 11 and an inner and outer ring spacer 12. The two angular contact ball bearings 10 are assembled back to back. The drive system 6 includes a servo motor and a servo driver. The angle measurement system 7 is integrated into the servo motor. The drive system 6 drives the work table 4 to rotate, providing the motion speed, angular velocity and acceleration for the object to be measured, facilitating the simultaneous detection of multiple devices and improving the detection efficiency. The control method of directly driving the work table 4 with a high-performance rare earth permanent magnet servo motor is adopted, which is convenient for control. The work table 4 is light in weight and has a small moment of inertia, which improves the test rate accuracy. The work table 4 is protected by the top cover 3 to improve the detection accuracy.

[0031] Example 2, based on Example 1, Figure 4-8 The top cover 3 includes an external cover 301, an end ring 302 is provided on the side of the external cover 301 close to the platform 1, an internal cover 303 is installed on one side of the end ring 302, the external cover 301 is sleeved on the outside of the internal cover 303, a limiting groove 304 is provided on the outer wall of the internal cover 303, and a suction cup 305 is installed on the inner wall of the external cover 301. The suction cup 305 and the limiting groove 304 are negatively adsorbed by the suction cup 305 to fix the external cover 301 and the internal cover 303 for length adjustment. A positioning mounting part 310 is installed on the side of the ring 302 close to the platform 1, and the end of the suction cup 305 is in close contact with the inner wall of the limiting groove 304. A connecting groove 306 is opened inside the external cover body 301, and the connecting groove 306 is connected with each suction cup 305. A side tube 307 is installed on the outer wall of the external cover body 301 and connected with the connecting groove 306. A piston 308 is movably installed inside the side tube 307, and a screw 309 is installed on the piston 308. A screw barrel is installed on the side tube 307, and the screw 309 is threadedly connected to the screw barrel.

[0032] The positioning mounting part 310 includes an end groove 3101 opened at an equal angle on the side of the end ring 302 close to the platform 1, a positioning cylinder 3102 is installed inside the end groove 3101, a positioning groove is opened at an equal angle on the platform 1, the positioning cylinder 3102 is inserted into the positioning groove during installation, a side groove 3103 is opened at an equal angle on the outer wall of the positioning cylinder 3102, a friction plate 3104 is movably installed inside the side groove 3103, a protective sleeve 313 is provided on the outer side of the positioning cylinder 3102, the inner wall of the protective sleeve 313 contacts the outer wall of the friction plate 3104, the protective sleeve 313 can enter the end groove 3101, a pressure plate 3106 is provided on the side of the friction plate 3104 close to the interior of the positioning cylinder 3102, a guide rod 3105 is installed on the friction plate 3104, the pressure plate 3106 is slidably connected to the guide rod 3105, and the friction plate 3104 and the pressure plate 31 06, a first spring 3107 is symmetrically installed between the two ends of the positioning cylinder 3102, a push rod 3108 is movably installed inside the positioning cylinder 3102, a first connecting rod 3109 is provided between the push rod 3108 and each pressure plate 3106, and the two ends of the first connecting rod 3109 are hinged to the push rod 3108 and the pressure plate 3106 respectively, and an adaptive adjustment member 311 is installed between each push rod 3108 and the external cover body 301, the external cover body 301 is sleeved on the outside of the internal cover body 303, and a suction cup 305 is installed on the inner wall of the external cover body 301, which is fixed by negative pressure adsorption between the suction cup 305 and the internal cover body 303, so as to facilitate the adjustment of the length of the top cover 3, thereby facilitating the protection of work surfaces 4 of different thicknesses, and at the same time, the positioning cylinder 3102 is inserted into the positioning groove, and the top cover 3 is installed by the friction between the friction plate 3104 and the inner wall of the positioning groove, which is convenient to use.

[0033] The adaptable adjustment member 311 includes two plate grooves 3111 opened inside the end ring 302, a middle groove 3112 is opened between the two plate grooves 3111, a tooth plate 3113 is slidably installed inside the plate groove 3111, one tooth plate 3113 is fixedly connected to the push rod 3108, and the other tooth plate 3113 is fixedly connected to the external cover 301, and a gear 3114 is rotatably installed inside the middle groove 3112, and the gear 3114 is engaged with the two tooth plates 3113 and connected to the external cover 301. A clamping fixing part 312 is provided on the outer side of the connected tooth plate 3113. When the length of the top cover 3 increases, the push rod 3108 moves toward the pressure plate 3106 through the two tooth plates 3113 and the gear 3114, pushing the pressure plate 3106 toward the side of the friction plate 3104, so that the elastic force of the first spring 3107 increases, so that as the length of the top cover 3 increases, the friction resistance between the friction plate 3104 and the inner wall of the positioning groove increases, thereby adaptively improving the installation stability of the top cover 3 and facilitating the protection of the work surface 4.

[0034] The clamping fixture 312 includes a movable groove 3121, which is opened on the side of the plate groove 3111 away from the middle groove 3112 on which the tooth plate 3113 connected to the external cover body 301 is installed. A rod groove 3122 is opened at one end of the movable groove 3121 close to the end groove 3101. A clamping plate 3123 is installed in the longitudinal sliding of the movable groove 3121, and a cross bar 3124 is installed in the transverse sliding of the rod groove 3122. A second connecting rod 3126 is provided between the cross bar 3124 and the clamping plate 3123. The two ends of the second connecting rod 3126 are respectively hinged to the clamping plate 3123 and the cross bar 3124. One end of the cross bar 3124 The second spring 3125 is installed at the other end of the cross bar 3124 in the end groove 3101, and the protective sleeve 313 is provided on the outer side of the positioning cylinder 3102 to prevent the friction plate 3104 from moving outward under the action of the elastic force, so as to facilitate the subsequent installation. After the installation, the protective sleeve 313 enters the end groove 3101, so that the top cover 3 and the platform body 1 are in close contact, thereby improving the protection effect. After the protective sleeve 313 is pushed into the end groove 3101, the cross bar 3124 is pushed to move laterally, and the second connecting rod 3126 is used to push the clamping plate 3123 to move and tighten the tooth plate 3113, thereby further pressing and fixing the outer cover body 301 and the inner cover body 303.

[0035] Operating Principle: The device utilizes a servo motor direct-drive control mode. A motor driver drives the servo motor, which transmits its output torque through a coupling to a precision shaft system 5. The shaft rotates, driving the work surface 4, on which the test piece is mounted. This provides flexible and convenient system control. This direct motor drive approach simplifies system design, improves mechanical transmission efficiency, and enhances system reliability. The device features both position and velocity modes. An absolute encoder collects position, velocity, acceleration, and other information and feeds it back to the control system. The encoder's high precision ensures accurate acquisition and control.

[0036] To protect power devices and improve overall system reliability, the system implements comprehensive self-protection, integrating multiple protection features, including undervoltage, overcurrent, leakage, over-limit, and system pump energy discharge protection. Power device protection relies not only on hardware protection circuits but also on computer monitoring. If the computer detects a problem with the hardware protection circuits or monitoring parameters, it can trigger an alarm or shut down the system. To ensure system operation even under severe interference, all external interfaces are optically isolated.

[0037] Since the rigidity and deformation of the working table 4 have a great influence on the test rate accuracy of the test piece, the device is provided with a top cover 3. When the device is transported or idle, the top cover 3 should be installed to protect the working table 4. When installing the top cover 3, the positioning cylinder 3102 on the end ring 302 is inserted into the corresponding positioning groove on the table body 1. During the process of inserting the positioning cylinder 3102 into the positioning groove, the protective cover 313 is pushed into the end groove 3101. After the protective cover 313 moves, the outer wall of the friction plate 3104 is in close contact with the inner wall of the positioning groove. Thus, the installation of the top cover 3 is completed. Since the thickness of the work surface 4 may be different, the relative positions of the outer cover 301 and the inner cover 303 are adjusted according to the thickness of the work surface 4. The outer cover 301 is moved outward, and then the screw 309 is screwed to pull the piston 308 outward, so that the suction cup 305 generates negative pressure suction on the inner cover 303, fixing the outer cover 301 and the inner cover 303. This makes it convenient to adjust the length of the top cover 3 and to protect work surfaces 4 of different thicknesses.

[0038] When the length of the top cover 3 increases, the tooth plate 3113 connected to the outer cover body 301 moves toward the side away from the positioning cylinder 3102, and the push rod 3108 is driven to move toward the pressure plate 3106 through the gear 3114 and the other tooth plate 3113. The pressure plate 3106 is pushed toward the friction plate 3104 through the first connecting rod 3109. When the top cover 3 is installed, the friction between the friction plate 3104 and the inner wall of the positioning groove increases, thereby adaptively improving the installation stability of the top cover 3 as the length of the top cover 3 increases.

[0039] When the protective cover 313 is pushed into the end groove 3101, the cross bar 3124 is pushed toward the inside of the movable groove 3121, and then the clamping plate 3123 is pushed toward the tooth plate 3113 through the second connecting rod 3126 until the second connecting rod 3126 is tightly attached to the tooth plate 3113, thereby tightening the tooth plate 3113, thereby further improving the fixing effect between the outer cover body 301 and the inner cover body 303.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A speed generating device, comprising a platform (1) and two handles (2) on the outer wall of the platform (1), characterized in that: The platform (1) is provided with a drive system (6) installed inside the platform (1), the output shaft of the drive system (6) is connected to the precision shaft system (5) through a coupling, a work surface (4) is installed at the end of the precision shaft system (5), the precision shaft system (5) is used to transmit the driving force of the drive system (6) to the work surface (4), the object to be measured is installed on the work surface (4), the drive system (6) can provide linear velocity, angular velocity and acceleration for the object to be measured, an angle measurement system (7) is provided inside the drive system (6), a top cover (3) is installed at one end of the platform (1), and the top cover (3) is used to protect the work surface (4) and the object to be measured; The precision shaft system (5) includes a main shaft and a support system. The two ends of the main shaft are connected to the coupling and the work table (4) respectively. The support system is used to support the main shaft. The support system consists of a bearing end cover (8), a bearing seat (9), two angular contact ball bearings (10), a locking nut (11) and inner and outer ring spacers (12). The two angular contact ball bearings (10) are assembled back to back. The drive system (6) includes a servo motor and a servo driver. The angle measurement system (7) is integrated into the servo motor. The top cover (3) includes an external cover body (301), an end ring (302) is provided on one side of the external cover body (301) close to the platform body (1), an internal cover body (303) is installed on one side of the end ring (302), the external cover body (301) is sleeved on the outside of the internal cover body (303), a limiting groove (304) is provided on the outer wall of the internal cover body (303), a suction cup (305) is installed on the inner wall of the external cover body (301), and the external cover body (301) and the internal cover body (303) that are adjusted in length are fixed by negative pressure adsorption between the suction cup (305) and the limiting groove (304), and the end ring (302) is installed on the inner wall of the external cover body (301). A positioning mounting member (310) is installed on the side of the cover (302) close to the platform (1), the end of the suction cup (305) is in close contact with the inner wall of the limiting groove (304), a connecting groove (306) is opened inside the external cover (301), and the connecting groove (306) is connected with each suction cup (305), and a side tube (307) is installed on the outer wall of the external cover (301) in communication with the connecting groove (306), a piston (308) is movably installed inside the side tube (307), a screw (309) is installed on the piston (308), a screw barrel is installed on the side tube (307), and the screw (309) is threadedly connected to the screw barrel.

2. A velocity generating device according to claim 1, characterized in that: The positioning mounting member (310) comprises an end groove (3101) provided at an equal angle on the side of the end ring (302) close to the platform (1); a positioning cylinder (3102) is installed inside the end groove (3101); a positioning groove is provided at an equal angle on the platform (1); during installation, the positioning cylinder (3102) is inserted into the positioning groove; a side groove (3103) is provided at an equal angle on the outer wall of the positioning cylinder (3102); a friction plate (3104) is movably installed inside the side groove (3103); a protective sleeve (313) is provided on the outer side of the positioning cylinder (3102); the inner wall of the protective sleeve (313) contacts the outer wall of the friction plate (3104), and the protective sleeve (313) can enter the interior of the end groove (3101).

3. A velocity generating device according to claim 2, characterized in that: A pressure plate (3106) is provided on one side of the friction plate (3104) close to the interior of the positioning cylinder (3102), a guide rod (3105) is installed on the friction plate (3104), the pressure plate (3106) and the guide rod (3105) are slidably connected, a first spring (3107) is symmetrically installed between the friction plate (3104) and the pressure plate (3106), a push rod (3108) is movably installed inside the positioning cylinder (3102), a first connecting rod (3109) is provided between the push rod (3108) and each pressure plate (3106), the two ends of the first connecting rod (3109) are hinged to the push rod (3108) and the pressure plate (3106), and an adaptive adjustment member (311) is installed between each push rod (3108) and the external cover (301).

4. A velocity generating device according to claim 3, characterized in that: The adaptive adjustment member (311) includes two plate grooves (3111) opened inside the end ring (302), a middle groove (3112) is opened between the two plate grooves (3111), a tooth plate (3113) is slidably installed inside the plate groove (3111), one tooth plate (3113) is fixedly connected to the push rod (3108), and the other tooth plate (3113) is fixedly connected to the external cover body (301), a gear (3114) is rotatably installed inside the middle groove (3112), the gear (3114) is engaged with the two tooth plates (3113), and a clamping fixing member (312) is provided on the outer side of the tooth plate (3113) connected to the external cover body (301).

5. A velocity generating device according to claim 4, characterized in that: The clamping fixture (312) includes a movable groove (3121), which is provided on a side of a plate groove (3111) on which a tooth plate (3113) connected to the external cover (301) is installed, away from the middle groove (3112). A rod groove (3122) is provided at one end of the movable groove (3121) close to the end groove (3101), and a clamping plate (3123) is longitudinally slidably installed inside the movable groove (3121). A cross bar (3124) is installed in a transverse sliding manner inside the rod groove (3122), and a second connecting rod (3126) is provided between the cross bar (3124) and the pressing plate (3123). The two ends of the second connecting rod (3126) are hinged to the pressing plate (3123) and the cross bar (3124) respectively. One end of the cross bar (3124) is located in the end groove (3101), and the other end of the cross bar (3124) is installed with a second spring (3125).

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