Dynamic balance testing device for transmission shaft

Abstract

The utility model relates to a transmission shaft dynamic balance testing device comprising a pedestal, the pedestal is provided with a dynamic balance tester, a left clamping jaw device and a right clamping jaw device, and the pedestal is provided with a translation device used for driving the right clamping jaw device to move left and right; the clamping jaw device comprises a bearing seat and a base, the base is rotationally connected to the bearing seat through a bearing, a plurality of clamping jaw mechanisms which are annularly arranged are arranged on one side of the base in the circumferential direction, a containing block is arranged in the center of the base, a containing groove is formed in the center of the end face of the containing block, and the containing groove is used for receiving the shaft end of a transmission shaft. A clamping jaw driving part is arranged on the other side of the base, a coupler is fixed on the clamping jaw driving part, and the coupler located on the left side is connected with a motor rotating shaft of the dynamic balance tester; the clamping device has the advantages that the clamping jaws can clamp the ends of the middle regular-size section, the long and thin parts at the two ends can be inserted into the containing grooves, and clamping and fixing of the transmission shaft with the two long and thin ends and the middle regular-size section are achieved.

Description

Technical Field

[0001] This utility model relates to the field of machining, and in particular to a dynamic balancing test device for transmission shafts. Background Technology

[0002] A driveshaft is a shaft component used to transmit power between different mechanical components, ensuring efficient and stable power transmission from the power source. A variable diameter driveshaft is a specially designed driveshaft whose diameter varies along its length to adapt to different mechanical needs and application scenarios, such as stepped variable diameter driveshafts, tapered variable diameter driveshafts, and so on.

[0003] In some specialized industrial machinery, due to the limited internal transmission space, there are high requirements for the diameter of the drive shaft. However, the power source of such machinery is of conventional size, and a conventional shaft system is used for transmission. This requires a sharp change in the diameter of the drive shaft in the axial direction. How to design such a drive shaft to meet the operational requirements while having advantages such as light weight and wide applicability is currently a focus of gear and shaft manufacturers.

[0004] Therefore, this application designs as follows Figure 1 and Figure 2 The transmission shaft structure shown includes an intermediate shaft section, a transition shaft section fixed on both sides of the intermediate shaft section, and a variable diameter shaft section fixed on the transition shaft section. The intermediate shaft section and the transition shaft section have the same outer diameter, and the outer diameter of the variable diameter shaft section is 1 / 7 to 1 / 5 of the outer diameter of the transition shaft section. A transmission gear is integrally formed on the intermediate shaft section.

[0005] After production, driveshafts require dynamic balancing tests, especially variable-diameter driveshafts. Variable-diameter designs can lead to uneven mass distribution, making post-manufacturing dynamic balancing testing crucial. Current dynamic balancing equipment uses grippers or chucks to clamp and fix standard-sized driveshafts before testing. See the automotive driveshaft dynamic balancing testing device disclosed in patent CN215296561U for reference. However, for… Figure 1 The transmission shaft structure shown is unstable due to the thin diameter section. If the transition shaft section is to be clamped, the current gripper structure cannot reach it due to the presence of the diameter section. Therefore, the current transmission shaft dynamic balancing test device needs to be improved.

[0006] Therefore, this case is brought. Utility Model Content

[0007] The purpose of this invention is to provide a dynamic balancing testing device for transmission shafts, which can clamp slender, variable-diameter shafts at both ends and improve testing accuracy.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] A dynamic balancing test device for a drive shaft includes a base and a control cabinet located on one side of the base. The base is provided with a dynamic balancing tester, a left gripper device, and a right gripper device from left to right. The base is also provided with a translation device for driving the right gripper device to move left and right.

[0010] The gripper device includes a bearing housing and a base. The bearing housing on the left is fixed to the top surface of the base, and the bearing housing on the right is fixed to the translation end of the translation device. The base is rotatably connected to the bearing housing through the bearing. A plurality of gripper mechanisms arranged in a ring are provided on one side of the base. A receiving block is provided at the center of the base, and a receiving groove is opened at the center of the end face of the receiving block. The receiving groove is used to receive the shaft end of the transmission shaft. A gripper drive unit is provided on the other side of the base. A coupling is fixed on the side of the gripper drive unit away from the base. The coupling on the left side is connected to the motor shaft of the dynamic balancing tester.

[0011] Furthermore, the receiving block includes a frustum-shaped segment and a connecting shaft. The smaller end of the frustum-shaped segment faces outward, and the larger end faces inward. A channel that is slidably connected to the connecting shaft is provided in the base. The two ends of the connecting shaft are respectively fixed to the moving end of the gripper drive unit and the larger end of the frustum-shaped segment. The gripper drive unit pushes the connecting shaft to move the frustum-shaped segment left and right.

[0012] The gripper mechanism includes a gripper, a tension spring, and a roller. The front end of the gripper is a clamping part, and the middle part is rotatably connected to the base via a pin. The roller is installed at the rear end of the gripper and travels on the inclined surface of the frustum-shaped section. One end of the tension spring is connected to the gripper, and the connection point is located between the roller and the pin. The other end of the tension spring is connected to the base. Through the tension spring, the roller is always in contact with the inclined surface of the frustum-shaped section.

[0013] Furthermore, mounting grooves are provided on the inner walls of the opposite sides of the receiving groove. A clamping block and a compression spring are provided in the mounting groove. The compression spring is located between the clamping block and the bottom surface of the mounting groove, and its two ends are fixed to the clamping block and the bottom surface of the mounting groove, respectively. When the compression spring is in the initial state, the clamping block is partially pushed out of the mounting groove. When the compression spring is in the contracted state, the clamping block just enters the mounting groove.

[0014] Furthermore, the bottom surface of the receiving groove is provided with a second compression spring, a push plate and a pin. The second compression spring is located between the push plate and the bottom surface of the receiving groove, and its two ends are fixed to the push plate and the bottom surface of the receiving groove respectively. The pin seat end of the pin is fixed to the push plate, and the pin tip faces the opening side of the receiving groove.

[0015] Furthermore, the connecting shaft and the channel are slidably connected via a linear bearing.

[0016] Furthermore, the clamping surface of the gripper is provided with teeth.

[0017] Furthermore, the clamping surface of the gripper is equipped with an anti-slip rubber pad.

[0018] Furthermore, an end plate is provided on the right side of the bearing housing located on the right side. The end plate has a hole and a bearing is installed on it. A support shaft is fixed on the coupling located on the right side, and the end of the support shaft away from the coupling is rotatably connected to the end plate through the bearing.

[0019] Furthermore, the translation device includes a lead screw, a lead screw nut block, and a lead screw drive unit. The lead screw is arranged in a left-right direction and its two ends are rotatably connected to the base. The lead screw drive unit is used to drive the lead screw to rotate. The lead screw nut block is threadedly connected to the lead screw, and the bottom of the lead screw nut block is slidably connected to the base. The bearing seat of the gripper device on the right side is fixed on the lead screw nut block.

[0020] Furthermore, the base includes a platform and a column foot. The bottom surface of the platform is provided with an internal threaded hole corresponding to the column foot, and the top surface of the column foot is provided with an external threaded post. The column foot is fixed to the platform through the threaded connection between the external threaded post and the internal threaded hole.

[0021] The outer wall of the column base near the insertion column is provided with external threads and a locking ring is threadedly connected. After the locking ring is tightened, it is tightly attached to the bottom surface of the platform. A through hole is opened on the locking ring, and a tensioning bolt is provided in the through hole. A bolt hole corresponding to the through hole is opened on the platform. After the locking ring is tightened, the through hole and the bolt hole are aligned. The tensioning bolt passes through the through hole and is screwed into the bolt hole.

[0022] The advantages of this utility model are:

[0023] 1. By providing a receiving groove at the center of the gripper device, the interior of the gripper device can also accommodate the drive shaft body, for example... Figure 1 The variable diameter shaft shown has slender ends and a conventional middle section. When using the gripper device of this application, the gripper can hold the end of the conventional middle section, and the slender ends can be inserted into the receiving groove to achieve the clamping and fixing of this type of transmission shaft.

[0024] 2. When the drive shaft is turned and milled, center holes are provided on both end faces to facilitate positioning and support. This application utilizes the center holes to set ejector pins and clamping blocks in the receiving groove. The ejector pins and clamping blocks can fix the drive shaft and prevent it from moving and rotating unnecessarily.

[0025] 3. The installation design of the ejector pin and clamping block is combined with the drive structure of the gripper mechanism, which improves the integration of the gripper device, makes the structure reasonable, and ensures a tight grip.

[0026] 4. The connection structure between the base plate and the column feet was redesigned. Locking rings and pull-in bolts were used to eliminate the installation gaps in the existing installation structure and avoid unnecessary fluctuations in test data during the initial stage of balance testing due to the installation gaps. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the variable diameter drive shaft structure mentioned in the background art;

[0028] Figure 2 for Figure 1 A side view diagram;

[0029] Figure 3 This is a schematic diagram of the dynamic balancing test device for the transmission shaft in the embodiment;

[0030] Figure 4 This is a cross-sectional schematic diagram of the gripper device in the embodiment;

[0031] Figure 5 for Figure 3 Grip with a middle gripper device Figure 1 A schematic diagram of the state of the variable diameter drive shaft;

[0032] Figure 6 This is a schematic diagram of the assembly of the column base and the platform in the embodiment;

[0033] Label Explanation

[0034] 101. Intermediate shaft section; 102. Transition shaft section; 103. Variable diameter shaft section; 104. Center hole; 105. Gear; 2. Base; 201. Platform; 202. Column foot; 203. Internal threaded hole; 204. External threaded insert; 205. Locking ring; 206. Tensioning bolt; 207. Bolt hole;

[0035] 3. Control cabinet; 4. Dynamic balancing tester; 401. Motor;

[0036] 5. Gripper device; 501. Bearing seat; 502. Base; 503. Receiving block; 5031. Frustum-shaped section; 5032. Connecting shaft; 5033. Gripper block; 5034. Compression spring one; 5035. Compression spring two; 5036. Push plate; 5037. Ejector pin; 504. Receiving groove; 505. Gripper drive unit; 506. Coupling; 507. Pin; 508. Linear bearing; 509. Gripper; 510. Tension spring; 511. Roller; 512. Anti-slip rubber pad; 513. End plate; 514. Support shaft;

[0037] 601. Lead screw; 602. Lead screw nut block; 603. Lead screw drive unit. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" etc. indicated by the accompanying drawings are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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 the present invention.

[0039] This embodiment proposes a dynamic balancing testing device for transmission shafts, such as... Figure 3 As shown, the system includes a base 2 and a control cabinet 3 located on one side of the base 2. From left to right, the base 2 is equipped with a dynamic balancing tester 4, a left-side gripper device 5, and a right-side gripper device 5. The base 2 also has a translation device for driving the right-side gripper device 5 to move left and right. The dynamic balancing tester 4 includes a motor 401.

[0040] To achieve Figure 1 The clamping and fixing of the variable diameter drive shaft shown in the embodiment has been improved in this example, such as... Figure 4 As shown. The gripper device 5 includes a bearing seat 501 and a base 502. The bearing seat 501 on the left side is fixed to the top surface of the base 2, and the bearing seat 501 on the right side is fixed to the translation end of the translation device. The base 502 is rotatably connected to the bearing seat 501 through a bearing. A plurality of gripper mechanisms arranged in a ring are provided on one side of the base 502. A receiving block 503 is provided at the center of the base 502, and a receiving groove 504 is opened at the center of the end face of the receiving block 503. The receiving groove 504 is used to receive the variable diameter shaft section 103 of the transmission shaft. A gripper drive part 505 is provided on the other side of the base 502. A coupling 506 is fixed on the side of the gripper drive part 505 away from the base 502. The coupling 506 located on the left side is connected to the rotating shaft of the motor 401 of the dynamic balancing tester 4.

[0041] During testing, the variable diameter shaft section 103 of the drive shaft is inserted into the receiving groove 504, and the gripper mechanism holds the transition shaft section 102. Then, the dynamic balance test of the drive shaft can be performed. During the dynamic balance test, the motor 401 of the dynamic balance tester 4 drives the gripper devices 5 on both sides and the gripped drive shaft to rotate.

[0042] To improve the stability of clamping, the receiving block 503 has been improved in this embodiment, as detailed below.

[0043] The receiving block 503 includes a frustum-shaped segment 5031 and a connecting shaft 5032. The smaller end of the frustum-shaped segment 5031 faces outward, and the larger end faces inward. The base 502 has a channel that is slidably connected to the connecting shaft 5032. The two ends of the connecting shaft 5032 are respectively fixed to the moving end of the gripper drive unit 505 and the larger end of the frustum-shaped segment 5031. The gripper drive unit 505 pushes the connecting shaft 5032 to move the frustum-shaped segment 5031 left and right. The gripper mechanism includes a gripper 509, a tension spring 510, and a roller 511. The front end of the gripper 509 is a clamping part, and the middle part is rotatably connected to the base 502 via a pin 507. The roller 511 is installed at the rear end of the gripper 509 and travels on the inclined surface of the frustum-shaped section 5031. One end of the tension spring 510 is connected to the gripper 509, and the connection point is located between the roller 511 and the pin 507. The other end of the tension spring 510 is connected to the base 502. Through the tension spring 510, the roller 511 is always in contact with the inclined surface of the frustum-shaped section 5031.

[0044] Preferably, mounting grooves are formed on the inner walls of opposite sides of the receiving groove 504. A clamping block 5033 and a first compression spring 5034 are provided within the mounting grooves. The first compression spring 5034 is located between the clamping block 5033 and the bottom surface of the mounting groove, with both ends fixed to the clamping block 5033 and the bottom surface of the mounting groove, respectively. When the first compression spring 5034 is in its initial state, the clamping block 5033 is partially pushed out of the mounting groove. When the first compression spring 5034 is in its retracted state, the clamping block 5033 is precisely inserted into the mounting groove. Simultaneously, a second compression spring 5035, a push plate 5036, and a ejector pin 5037 are provided at the bottom surface of the receiving groove 504. The second compression spring 5035 is located between the push plate 5036 and the bottom surface of the receiving groove 504, with both ends fixed to the push plate 5036 and the bottom surface of the receiving groove 504, respectively. The pin seat end of the ejector pin 5037 is fixed to the push plate 5036, and the tip of the ejector pin 5037 faces the opening side of the receiving groove 504.

[0045] During testing, such as Figure 5As shown, the variable diameter shaft section 103 of the drive shaft is inserted into the receiving groove 504. During insertion, the two clamping plates are pushed into the mounting groove (the clamping plates need to be designed with rounded corners so that when the variable diameter shaft section 103 enters, the clamping plates can be pushed into the mounting groove along the rounded corners. This design is a conventional design in this field and will not be elaborated on here). Under the action of the compression spring 5034, the two clamping plates will apply a clamping force to the variable diameter shaft section 103; the variable diameter shaft section 103 enters the receiving groove 504. 4. The center hole 104 at the shaft end is placed against the ejector pin 5037 (in general shaft components, center holes 104 are provided at both ends for easy positioning and support). The ejector pin 5037 applies a clamping force to the shaft end under the action of the compression spring 5035. The gripper drive unit 505 can be a cylinder, which pushes the connecting shaft 5032 to move the frustum-shaped section 5031 left and right. The movement of the frustum-shaped section 5031 causes the roller 511 to travel on the inclined surface of the frustum-shaped section 5031, thereby causing the gripper 509 to clamp the transition shaft section 102 of the transmission shaft. Figure 5 Taking the middle gripper device as an example, when the gripper drive unit drives the frustum section to move to the right, the roller moves up along the inclined plane, thereby causing the gripper holding part to rotate downward to achieve clamping; due to the movement of the frustum section 5031, the clamping force of the ejector pin 5037 on the center hole 104 increases. Of course, at this time, it is also necessary to adjust the position of the right gripper device 5 through the translation device so that both ejector pins 5037 can clamp the two ends of the transmission shaft; then the dynamic balance test can be performed.

[0046] In this embodiment, a pin 5037 and a clamping block 5033 are arranged within the receiving groove 504 using the central hole 104. The pin 5037 and the clamping block 5033 can fix the drive shaft, preventing unnecessary movement and rotation. Simultaneously, the installation design of the pin 5037 and the clamping block 5033 is integrated with the drive structure of the gripper mechanism, improving the integration of the gripper device 5, resulting in a reasonable structure and secure clamping.

[0047] In this embodiment, the sliding connection between the connecting shaft 5032 and the channel can be achieved through a linear bearing 508. Meanwhile, to further improve the clamping force of the gripper 509, the clamping surface of the gripper is toothed, or an anti-slip rubber pad 512 can be added to the clamping surface to increase friction during clamping.

[0048] like Figure 2 As shown, the right side of the bearing housing 501 on the right side is provided with an end plate 513. The end plate 513 has a hole and a bearing is installed. The coupling 506 on the right side is fixed with a support shaft 514. The end of the support shaft 514 away from the coupling 506 is rotatably connected to the end plate 513 through the bearing. This makes the rotation of the gripper device 5 on the right side more stable.

[0049] Continue to refer to Figure 2The translation device in this embodiment includes a lead screw 601, a lead screw nut 602, and a lead screw drive unit. The lead screw 601 is arranged horizontally and its two ends are rotatably connected to the base 2. The lead screw drive unit is used to drive the lead screw 601 to rotate. The lead screw nut 602 is threadedly connected to the lead screw 601. The bottom of the lead screw nut 602 is slidably connected to the base 2 through a track. The track guides the translation of the lead screw nut 602 and also restricts the rotation of the lead screw nut 602. The bearing seat 501 of the gripper device 5 on the right side is fixed to the lead screw nut 602.

[0050] The base 2 includes a platform 201 and a column base 202. The existing connection structure between the column base 202 and the platform 201 is as follows: the bottom surface of the platform 201 has an internal threaded hole 203 corresponding to the column base 202, and the top surface of the column base 202 has an external threaded insert 204. The column base 202 is fixed to the platform 201 through the threaded connection between the external threaded insert 204 and the internal threaded hole 203. This connection method results in an installation gap between the column base 202 and the platform 201. When the drive shaft rotates at high speed for testing, especially during the initial acceleration phase, the test curve will fluctuate, affecting the judgment of the dynamic balance test.

[0051] To eliminate this installation gap, this embodiment improves the connection structure between the column base 202 and the platform 201, such as... Figure 5 As shown, the bottom surface of the platform 201 is provided with an internal threaded hole 203 corresponding to the column foot 202, and the top surface of the column foot 202 is provided with an external threaded insert 204. The column foot 202 is fixed to the platform 201 through the threaded connection between the external threaded insert 204 and the internal threaded hole 203. The outer wall of the column foot 202 near the insert is provided with an external thread and a locking ring 205 is threadedly connected. After the locking ring 205 is tightened, it is tightly attached to the bottom surface of the platform 201. The locking ring 205 has a through hole, and a tensioning bolt 206 is provided in the through hole. The platform 201 has a bolt hole 207 corresponding to the through hole. After the locking ring 205 is tightened, the through hole and the bolt hole 207 are aligned. The tensioning bolt 206 passes through the through hole and is screwed into the bolt hole 207. When the tensioning bolt 206 is screwed into the bolt hole 207, the installation gap between the platform 201 and the column foot 202 disappears, thereby ensuring the accuracy of the dynamic balance test.

[0052] The above embodiments are only used to explain the concept of this utility model, and are not intended to limit the protection of this utility model. Any non-substantial modifications made to this utility model using this concept should fall within the protection scope of this utility model.

Claims

1. A drive shaft dynamic balance testing device, comprising a base and a control cabinet located on one side of the base, the base is sequentially provided with a dynamic balance tester, a left clamping jaw device and a right clamping jaw device from left to right, and the base is provided with a translation device for driving the right clamping jaw device to move left and right. characterized in that The clamping jaw device comprises a bearing seat and a base, the left bearing seat is fixed on the top surface of the base, the right bearing seat is fixed on the translation end of the translation device, and the base is rotatably connected to the bearing seat through a bearing, a plurality of clamping jaw mechanisms are arranged in a ring shape on one side of the base, a receiving block is arranged at the center of the base, and a receiving groove is formed at the center of the end surface of the receiving block, the receiving groove is used to receive the shaft end of the drive shaft, and the other side of the base is provided with a clamping jaw driving part, the side away from the base of the clamping jaw driving part is fixed with a shaft coupling, and the left shaft coupling is connected with the motor shaft of the dynamic balance tester.

2. A drive shaft dynamic balance testing device as claimed in claim 1, characterized in that The receiving block comprises a circular truncated cone section and a connecting shaft, the small end of the circular truncated cone section faces outward, and the large end faces inward, a channel is formed in the base and is in sliding connection with the connecting shaft, and the two ends of the connecting shaft are fixed with the action end of the clamping jaw driving part and the large end of the circular truncated cone section respectively, and the clamping jaw driving part drives the connecting shaft to move left and right. The clamping jaw mechanism comprises a clamping jaw, a tension spring and a roller, the front end of the clamping jaw is a clamping part, the middle part is rotatably connected to the base through a pin shaft, the roller is installed at the rear end of the clamping jaw and walks on the inclined surface of the circular truncated cone section, one end of the tension spring is connected to the clamping jaw, and the connection point is located between the roller and the pin shaft, and the other end of the tension spring is connected to the base, so that the roller is always attached to the inclined surface of the circular truncated cone section through the tension spring.

3. A drive shaft dynamic balance testing apparatus as claimed in claim 2, wherein, The opposite inner walls of the receiving groove are provided with mounting grooves, the mounting grooves are provided with clamping blocks and a compression spring one, the compression spring one is located between the clamping block and the bottom surface of the mounting groove, and the two ends of the compression spring one are fixed with the clamping block and the bottom surface of the mounting groove respectively, when the compression spring one is in the initial state, the clamping block is partially pushed out of the mounting groove, and when the compression spring one is in the contraction state, the clamping block just enters the mounting groove.

4. A drive shaft dynamic balance testing apparatus as claimed in claim 2, wherein, The bottom surface of the receiving groove is provided with a compression spring two, a push plate and a thimble, the compression spring two is located between the push plate and the bottom surface of the receiving groove, and the two ends of the compression spring two are fixed with the push plate and the bottom surface of the receiving groove respectively, the thimble is fixed with the push plate at the needle seat end, and the needle tip end of the thimble faces the opening side of the receiving groove.

5. A drive shaft dynamic balance testing apparatus as claimed in claim 2, wherein, The connecting shaft and the channel are in sliding connection through a linear bearing.

6. A drive shaft dynamic balance testing apparatus as claimed in claim 2, wherein, The clamping surface of the clamping part of the clamping jaw is provided with teeth.

7. A drive shaft dynamic balance testing apparatus as claimed in claim 2, wherein, The clamping surface of the clamping part of the clamping jaw is provided with an anti-skid rubber pad.

8. A drive shaft dynamic balance testing apparatus as claimed in claim 1, wherein, The right side of the bearing seat on the right side is provided with an end plate, the end plate is provided with a hole and is provided with a bearing, the shaft coupling on the right side is fixed with a support shaft, and the end of the support shaft away from the shaft coupling is rotatably connected to the end plate through the bearing.

9. A drive shaft dynamic balance testing apparatus as claimed in claim 1, wherein, The translation device comprises a lead screw, a nut block and a lead screw driving part, the lead screw is arranged left and right and rotatably connected to the base at both ends, the lead screw driving part is used to drive the lead screw to rotate, the nut block is threadedly connected to the lead screw, the bottom of the nut block is in sliding connection with the base, and the bearing seat of the right clamping jaw device is fixed on the nut block.

10. A drive shaft dynamic balance testing apparatus as claimed in claim 1, wherein, The base comprises a platform and a column foot, the bottom surface of the platform is provided with an inner threaded hole corresponding to the column foot, the top surface of the column foot is provided with an outer threaded plug, and the column foot is fixed with the platform through the threaded connection of the outer threaded plug and the inner threaded hole; The outer wall of the column foot on the side of the plug is provided with an outer thread, and a lock ring is threadedly connected, the lock ring is tightly attached to the bottom surface of the platform after being screwed, a through hole is formed in the lock ring, a tension bolt is arranged in the through hole, a bolt hole corresponding to the through hole is formed in the platform, the through hole and the bolt hole are opposite after the lock ring is screwed, and the tension bolt is screwed into the bolt hole after passing through the through hole.

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