High-precision positioning engine body assembly test tool

Abstract

This utility model relates to the field of test positioning fixtures, and discloses a high-precision positioning engine block assembly test fixture, including a base. A motor is fixedly connected to the top of the base, and a rotating shaft is fixedly connected to the output end of the motor. A positioning plate is fixedly connected to the top of the rotating shaft. A guide groove is formed on the top of the base, and a bracket is provided on the top of the guide groove. A rotating wheel is rotatably connected to the inner wall of the bracket, and a support rod is fixedly connected to the top of the bracket. A through groove is formed on the outer wall of the positioning plate, and a top rod is provided inside the through groove. A T-shaped rod is fixedly connected to the bottom end of the top rod. In this utility model, the U-shaped quenched guide groove and the rotating wheel work together to ensure smooth and precise movement. Four-sided cylinder-driven flexible grippers and rubber pads achieve non-destructive clamping. Combined with vacuum adsorption and sponge suction cups, it adapts to different engine surfaces, significantly improving assembly accuracy, efficiency, and safety.

Description

Technical Field

[0001] This utility model relates to the field of test positioning fixtures, and in particular to a high-precision positioning test fixture for engine block assembly. Background Technology

[0002] Engine block assembly testing is conducted to ensure the reliability, safety, and performance stability of the engine during subsequent use. The test verifies whether the assembly accuracy meets the design requirements, and checks whether the fit clearance, sealing, and connection strength between parts meet the standards. This prevents wear, leakage, or malfunctions during operation caused by assembly errors. Positioning fixtures are required when testing the engine block, which ensures that the engine block under test is placed quickly and accurately at the predetermined position and angle on the test bench. This is the basis for all subsequent tests.

[0003] In existing technologies, the positioning methods for engine blocks during assembly and testing mainly rely on high-precision mechanical positioning, using the "2 pins and 1 surface" principle: this is the most classic and fundamental positioning method. Utilizing the process holes determined during engine block machining as positioning references, a cylindrical pin and a diamond pin are typically used in conjunction with a plane to achieve complete positioning. The cylindrical pin restricts two translational degrees of freedom, the diamond pin restricts one rotational degree of freedom, and the plane restricts three degrees of freedom. This method is low-cost, highly reliable, and fast, making it the mainstream choice for automated production lines.

[0004] The existing "2 pins and 1 surface" mechanical positioning method is too rigid and is prone to jamming, scratching of hole walls or surfaces due to slight deviations or foreign objects, resulting in workpiece scrap or leakage risks. It lacks flexibility, with one set of tooling only suitable for a single machine model, making model changeover cumbersome and severely restricting production efficiency and flexibility. The purely mechanical open-loop structure cannot compensate for the cumulative errors caused by wear and temperature changes, affecting key quality indicators such as assembly coaxiality. At the same time, rigid contact is prone to collision risks in automated loading and unloading, resulting in high maintenance costs. These problems together limit the realization of high-precision, multi-model mixed-line production. Therefore, a high-precision positioning engine body assembly and testing tooling is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a high-precision positioning engine block assembly and testing fixture, which aims to improve the problems of rigid positioning in the prior art that easily damages the workpiece, has poor adaptability, and restricts production accuracy and flexibility.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-precision positioning engine body assembly and testing fixture, including a base, a motor fixedly connected to the top of the base, a rotating shaft fixedly connected to the output end of the motor, a positioning plate fixedly connected to the top of the rotating shaft, a guide groove opened on the top of the base, a bracket set on the top of the guide groove, a rotating wheel rotatably connected to the inner wall of the bracket, a support rod fixedly connected to the top of the bracket, a through groove opened through the outer wall of the positioning plate, a top rod set inside the through groove, a T-shaped rod fixedly connected to the bottom end of the top rod, a spring fixedly connected to the outer wall of the T-shaped rod, a mounting bracket set on the outer wall of the positioning plate, a cylinder fixedly connected to the bottom of the mounting bracket, a flexible gripper rotatably connected to the output end of the cylinder, a sponge suction cup fixedly connected to the top of the positioning plate, and a vacuum pump fixedly connected to the bottom end of the sponge suction cup through a pipe.

[0007] As a further description of the above technical solution:

[0008] The outer wall of the rotating wheel is in contact with the inner wall of the guide groove, and the top end of the support rod is fixedly connected to the bottom of the positioning plate.

[0009] As a further description of the above technical solution:

[0010] The through groove is fitted onto the outer wall of the top rod, and the top end of the spring is fixedly connected to the bottom of the positioning plate.

[0011] As a further description of the above technical solution:

[0012] The outer wall of the flexible gripper is rotatably connected to the outer wall of the mounting frame via a rotating rod, and the outer wall of the vacuum pump is fixedly connected to the bottom of the positioning plate.

[0013] As a further description of the above technical solution:

[0014] The mounting brackets and cylinders are arranged in several groups, and the mounting brackets and cylinders are distributed at equal distances on the outer walls of the positioning plate.

[0015] As a further description of the above technical solution:

[0016] The outer wall of the positioning plate is provided with a T-shaped groove, and a T-shaped slider is slidably connected to the inner wall of the T-shaped groove. A screw is threadedly connected to the outer wall of the T-shaped slider through a nut, and a knob is fixedly connected to the end of the screw.

[0017] As a further description of the above technical solution:

[0018] The top of the T-shaped slider is fixedly connected to the bottom of the mounting bracket.

[0019] As a further description of the above technical solution:

[0020] The end of the screw away from the knob is rotatably connected to a support plate, and the top of the support plate is fixedly connected to the bottom of the positioning plate.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the U-shaped quenching guide groove and the rotating wheel work together to ensure smooth and precise movement. The cylinders arranged on all four sides drive the flexible grippers and rubber pads to achieve non-destructive clamping. Combined with vacuum adsorption and sponge suction cups, it adapts to different machine surfaces. The top rod and spring structure provide stable lifting and prevents slippage. Overall, it greatly improves assembly accuracy, efficiency and safety.

[0023] 2. In this utility model, by opening a precision-ground T-shaped groove on the side wall of the positioning plate and sliding it with the T-shaped slider, the positioning frame can be moved smoothly and accurately by rotating the knob to drive the screw. This realizes the flexible adjustment of the local clamping position, which can quickly adapt to the assembly requirements of engine blocks of different sizes, and improves the versatility, adjustment efficiency and positioning accuracy of the tooling. Attached Figure Description

[0024] Figure 1 This is a side view of the main structure of the high-precision positioning engine body assembly and testing fixture proposed in this utility model.

[0025] Figure 2 This is a front view schematic diagram of the main structure of the high-precision positioning engine body assembly and testing fixture proposed in this utility model.

[0026] Figure 3 This is a top view schematic diagram of the main structure of the high-precision positioning engine body assembly and testing fixture proposed in this utility model.

[0027] Figure 4 This is a bottom view of the main structure of the high-precision positioning engine body assembly and testing fixture proposed in this utility model.

[0028] Figure 5 This invention provides a high-precision positioning engine block assembly and testing fixture. Figure 4 Enlarged schematic diagram of region A in the middle.

[0029] Legend:

[0030] 1. Base; 2. Motor; 3. Shaft; 4. Positioning plate; 5. Guide groove; 6. Bracket; 7. Rotary wheel; 8. Support rod; 9. Through groove; 10. Top rod; 11. Spring; 12. T-shaped rod; 13. Mounting bracket; 14. Cylinder; 15. Flexible gripper; 16. Sponge suction cup; 17. Vacuum pump; 18. T-shaped groove; 19. T-shaped slider; 20. Screw; 21. Support plate; 22. Knob. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-3 This utility model provides an embodiment of a high-precision positioning engine block assembly and testing fixture, comprising a base 1, a motor 2 fixedly connected to the top of the base 1, a rotating shaft 3 fixedly connected to the output end of the motor 2, a positioning plate 4 fixedly connected to the top of the rotating shaft 3, a guide groove 5 formed on the top of the base 1, the guide groove 5 having a U-shaped cross-section and its inner wall hardened for high wear resistance, a bracket 6 provided on the top of the guide groove 5, a rotating wheel 7 rotatably connected to the inner wall of the bracket 6, the outer wall of the rotating wheel 7 contacting the inner wall of the guide groove 5, a support rod 8 fixedly connected to the top of the bracket 6, the top end of the support rod 8 fixedly connected to the bottom of the positioning plate 4, and a mounting bracket 1 provided on the outer wall of the positioning plate 4. 3. A cylinder 14 is fixedly connected to the bottom of the mounting bracket 13. Several sets of mounting brackets 13 and cylinders 14 are provided, and the sets of mounting brackets 13 and cylinders 14 are distributed at equal distances on the outer walls of the positioning plate 4. A flexible gripper 15 is rotatably connected to the output end of the cylinder 14. The gripping part of the flexible gripper 15 is covered with a rubber pad to prevent damage to the surface of the engine block. The outer wall of the flexible gripper 15 is rotatably connected to the outer wall of the mounting bracket 13 through a rotating rod. The number of flexible grippers 15 is equal to the number of cylinders 14. Four sets of mounting brackets 13 are provided on the front and rear sides of the positioning plate 4, and two sets of mounting brackets 13 are provided on the left and right sides of the positioning plate 4, which can provide four-sided clamping for the engine block.

[0033] Reference Figures 2-4 A through groove 9 is provided through the outer wall of the positioning plate 4. The through groove 9 is fitted onto the outer wall of the push rod 10. The push rod 10 is installed inside the through groove 9. A T-shaped rod 12 is fixedly connected to the bottom end of the push rod 10. The T-shaped rod 12 can limit the sliding stroke of the push rod 10 and prevent the push rod 10 from coming out of the through groove 9. A spring 11 is fixedly connected to the outer wall of the T-shaped rod 12. The top end of the spring 11 is fixedly connected to the bottom of the positioning plate 4. A sponge suction cup 16 is fixedly connected to the top of the positioning plate 4. The sponge suction cup 16 has good sealing and deformation capabilities and can adapt to the surface of the engine body of different shapes. A vacuum pump 17 is fixedly connected to the bottom end of the sponge suction cup 16 through a pipe. The outer wall of the vacuum pump 17 is fixedly connected to the bottom of the positioning plate 4.

[0034] Reference Figure 5The outer wall of the positioning plate 4 is provided with a T-slot 18. The inner wall of the T-slot 18 is precision ground and has a low surface roughness. A T-slide block 19 is slidably connected to the inner wall of the T-slot 18. The top of the T-slide block 19 is fixedly connected to the bottom of the mounting bracket 13. A screw 20 is threadedly connected to the outer wall of the T-slide block 19 through a nut. A knob 22 is fixedly connected to the end of the screw 20. A support plate 21 is rotatably connected to the end of the screw 20 away from the knob 22. The top of the support plate 21 is fixedly connected to the bottom of the positioning plate 4. There are four T-slots 18, which are set in pairs on the right outer wall of the positioning plate 4. The T-slots 19 are connected to the two sets of mounting brackets 13 on the right side of the positioning plate 4 through the pairs of T-slide blocks 19, so that the mounting brackets 13 at the corresponding positions can be adjusted synchronously as the T-slide blocks 19 move.

[0035] Working principle: The vacuum pump 17 is activated, which creates negative pressure on the sponge suction cup 16 through a pipe. The operator places the engine block on top of the positioning plate 4. The sponge suction cup 16 uses the negative pressure to adhere to the bottom of the engine block, achieving initial positioning. Simultaneously, the bottom of the engine block contacts the top of the push rod 10 and presses it down. The push rod 10 drives the T-shaped rod 12 downward, compressing the spring 11. The reaction force of the spring 11 acts on the push rod 10, assisting in tightening the engine block and further enhancing the stability of the initial positioning. To adapt to different engine block specifications, rotate the knob 22... When the screw 20 rotates, it drives the T-slider 19 to move along the T-slider 19 because the screw 20 is threadedly connected to the nut on the outer wall of the T-slider 19, and the T-slider 19 slides within the T-slot 18 of the positioning plate 4. This rotation of the screw 20 causes the T-slider 19 to move along the T-slot 18, thereby adjusting the position of the mounting bracket 13 fixed to the top of the T-slider 19. The right side of the positioning plate 4 connects two sets of mounting brackets 13 to the T-slider 19 via two sets of T-slots 18, and four sets of mounting brackets 13 are connected to each of the front and rear sides. Through the above adjustments, the clamping components on the mounting brackets 13 can be ensured to be aligned with the four sides of the machine body. With precise alignment, the cylinders 14 distributed around the positioning plate 4 extend, and the output end of the cylinders 14 pushes the flexible gripper 15. Since the flexible gripper 15 is rotatably connected to the mounting bracket 13 through a rotating rod, under the thrust of the cylinders 14, the flexible gripper 15 rotates around the rotating rod as a fulcrum and moves towards the machine body, finally clamping the machine body tightly from all four sides, achieving high-precision positioning and fixing, and meeting the stability requirements of the machine body for assembly testing. If it is necessary to adjust the angle of the machine body, the motor 2 at the top of the base 1 is started. The motor 2 drives the rotating shaft 3 to rotate, and the rotating shaft 3 drives the positioning plate 4 and the upper part of it. The fixed machine body rotates synchronously. At the same time, the bracket 6 connected to the bottom of the positioning plate 4 via the support rod 8 moves with the positioning plate 4. The rotating wheel 7 on the inner wall of the bracket 6 rolls in the guide groove 5 of the base 1, providing guidance and support for the rotation of the positioning plate 4, ensuring stability and accuracy during the rotation process. First, the control cylinder 14 retracts, driving the flexible gripper 15 to rotate in the opposite direction to release the machine body. Then, the vacuum pump 17 is turned off, the negative pressure of the sponge suction cup 16 disappears, releasing the adsorption on the machine body. Finally, the machine body is removed, and the top rod 10 resets under the elastic force of the spring 11, waiting for the next operation.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-precision positioning engine block assembly and testing fixture, including a base (1), characterized in that: A motor (2) is fixedly connected to the top of the base (1), and a rotating shaft (3) is fixedly connected to the output end of the motor (2). A positioning plate (4) is fixedly connected to the top of the rotating shaft (3). A guide groove (5) is provided on the top of the base (1), and a bracket (6) is provided on the top of the guide groove (5). A rotating wheel (7) is rotatably connected to the inner wall of the bracket (6), and a support rod (8) is fixedly connected to the top of the bracket (6). A through groove (9) is provided through the outer wall of the positioning plate (4), and the inside of the through groove (9) is provided with... There is a top rod (10), and a T-shaped rod (12) is fixedly connected to the bottom end of the top rod (10). A spring (11) is fixedly connected to the outer wall of the T-shaped rod (12). A mounting bracket (13) is provided on the outer wall of the positioning plate (4). A cylinder (14) is fixedly connected to the bottom of the mounting bracket (13). A flexible gripper (15) is rotatably connected to the output end of the cylinder (14). A sponge suction cup (16) is fixedly connected to the top of the positioning plate (4). A vacuum pump (17) is fixedly connected to the bottom end of the sponge suction cup (16) through a pipe.

2. The high-precision positioning engine block assembly and testing fixture according to claim 1, characterized in that: The outer wall of the rotating wheel (7) is in contact with the inner wall of the guide groove (5), and the top end of the support rod (8) is fixedly connected to the bottom of the positioning plate (4).

3. The high-precision positioning engine block assembly and testing fixture according to claim 1, characterized in that: The through groove (9) is sleeved on the outer wall of the top rod (10), and the top end of the spring (11) is fixedly connected to the bottom of the positioning plate (4).

4. The high-precision positioning engine block assembly and testing fixture according to claim 1, characterized in that: The outer wall of the flexible gripper (15) is rotatably connected to the outer wall of the mounting frame (13) via a rotating rod, and the outer wall of the vacuum pump (17) is fixedly connected to the bottom of the positioning plate (4).

5. The high-precision positioning engine block assembly and testing fixture according to claim 1, characterized in that: The mounting bracket (13) and cylinder (14) are provided in several groups, and the mounting bracket (13) and cylinder (14) are distributed at equal distances on the outer walls of the positioning plate (4).

6. The high-precision positioning engine block assembly and testing fixture according to claim 1, characterized in that: The outer wall of the positioning plate (4) is provided with a T-shaped groove (18), and a T-shaped slider (19) is slidably connected to the inner wall of the T-shaped groove (18). The outer wall of the T-shaped slider (19) is connected to a screw (20) by a nut thread, and a knob (22) is fixedly connected to the end of the screw (20).

7. The high-precision positioning engine block assembly and testing fixture according to claim 6, characterized in that: The top of the T-shaped slider (19) is fixedly connected to the bottom of the mounting bracket (13).

8. The high-precision positioning engine block assembly and testing fixture according to claim 6, characterized in that: The end of the screw (20) away from the knob (22) is rotatably connected to a support plate (21), and the top of the support plate (21) is fixedly connected to the bottom of the positioning plate (4).

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