A force value monitoring device for elastic cylindrical pin assembly

Abstract

The application discloses a force monitoring device for elastic cylindrical pin assembly. Different assembly devices are abutted by a plurality of contact rods, so that the contact rods at different positions are extruded by different contact surfaces of the devices and move different distances into a storage cylinder. Under the elastic force of a reciprocating spring, the contact rods at different positions always abut on different contact surfaces of the devices. When the devices are placed stably, an electric field box is started to form an electric field around the electric field box, so that liquid current variable liquid in the electric field box is converted into solid state, the position of the contact rod is fixed, and the devices are clamped.

Description

Technical Field

[0001] This application relates to the field of mechanical assembly testing technology, and in particular to a force monitoring device for the assembly of elastic cylindrical pins. Background Technology

[0002] The force monitoring device for elastic cylindrical pin assembly is used to experiment, monitor, and record the force exerted on the elastic cylindrical pin during the assembly process. This device can ensure the quality control and safety of the assembly process, and also help optimize the assembly process and improve production efficiency. The main components of the monitoring device include sensors, fixed sensors and assembly racks of the assembly device, data acquisition system, alarm system, and recording and storage system.

[0003] During experiments or assembly, the elastic cylindrical pin is subjected to external forces such as pressure, tension, and friction. Sensors convert these force values ​​into electrical signals, which are then processed and recorded by a data acquisition system. Operators can view the force value change curve in real time on a display screen and make adjustments and controls as needed. When the force value exceeds the preset safety range, the alarm system will sound an alarm to alert the operator.

[0004] During use, attention should be paid to calibrating and testing the sensor to ensure its accuracy and stability. During assembly, the connection between the sensor and the elastic cylindrical pin should be ensured to be firm and reliable to avoid loosening or falling off. Operators should be familiar with the use and operation procedures of the monitoring device to correctly perform monitoring and recording work, and regularly maintain and service the monitoring device to ensure its long-term stable operation. However, existing monitoring devices use too simple clamps when fixing assembly parts of different shapes, especially for irregularly shaped parts, which cannot effectively fix them. This leads to loosening of the device during assembly and displacement between it and the elastic cylindrical pin, affecting the monitoring data. Summary of the Invention

[0005] This application proposes a force monitoring device for the assembly of elastic cylindrical pins. It features multiple contact rods that abut against different surfaces of the device for multi-point contact fixing. The contact rods move under pressure from the device surface, pushing hydraulic oil to press other contact rods against surfaces that are difficult to reach. The liquid electrorheological fluid, under the action of an electric field, transforms into a solid state to fix and clamp the device to the contact rods. The moving contact rods also compress the flow of the electrorheological fluid, causing mixing. This addresses the problem that existing force monitoring devices for elastic cylindrical pin assemblies cannot handle devices of different shapes when clamping them.

[0006] To achieve the above objectives, this application adopts the following technical solution: a force monitoring device for assembling elastic cylindrical pins, comprising a monitoring frame and four clamps mounted on the monitoring frame; each clamp includes a back plate, an electric field box connected to one end of the back plate, and a sealing plate connected to one side of the electric field box. A uniformly distributed storage cylinder is provided on the end of the back plate facing the electric field box. A contact rod is provided inside the storage cylinder, protruding from the sealing plate to the outside of the electric field box, for contacting the device and performing clamping operations. A reciprocating spring is fixedly connected to one end of the contact rod located inside the storage cylinder, for providing a force to the contact rod to compress the device. The electric field box is filled with electrorheological fluid for fixing the moved contact rod.

[0007] Preferably, a crossbeam is provided at the top center of the monitoring frame, and a sensor mounting bracket is provided at the bottom end of the crossbeam for stably installing the monitoring sensor.

[0008] Preferably, the bottom top plane of the monitoring frame is provided with symmetrical slide rails, and hydraulic cylinders are symmetrically arranged at both ends of the long side of the slide rails. A hydraulic rod is arranged inside the hydraulic cylinder, and a limit block is connected to the end of the hydraulic rod away from the hydraulic cylinder. The limit block is connected to the bottom end of the electric field box and is used to drive the clamp to perform reciprocating linear motion.

[0009] Preferably, the contact rod has evenly distributed recessed annular grooves for agitating the surrounding electrorheological fluid and fixing the contact rod after the electrorheological fluid has solidified.

[0010] Preferably, an interconnecting pipe is connected between adjacent storage cylinders, and the storage cylinders are filled with hydraulic oil for pressing the squeezed hydraulic oil into the storage cylinder connected by the empty contact rod.

[0011] Preferably, the back plate has evenly distributed movable holes, and a connecting hole is formed between the bottoms of adjacent movable holes. A vertical flow hole is formed at the center of the connecting hole and is connected to the inner cavity of the electric field box to provide a channel for the flow of electrorheological fluid.

[0012] Preferably, one end of the single movable hole facing the inner cavity of the electric field box is connected to the inner cavity of one of the storage cylinders. A piston is provided in the movable hole, and one end of the piston facing the contact rod is connected to the end of the reciprocating spring away from the contact rod, for receiving the force of the contact rod movement.

[0013] Preferably, two limiting rings are provided on the side of the inner cavity of the storage cylinder near the back plate, and the interconnecting tube is located between the two limiting rings to limit the movement distance of the piston and the contact rod.

[0014] Preferably, hanging springs are provided at the four corners of the top of the inner cavity of the electric field box, and the bottom of the hanging springs are fixedly connected to a baffle plate to provide more flow directions and space for the electrorheological fluid.

[0015] This application provides a force monitoring device for assembling elastic cylindrical pins. Multiple contact rods abut against assembly components of different shapes, causing the contact rods at different locations to be squeezed by different contact surfaces of the components and move different distances into the storage cylinder. Under the elastic force of a reciprocating spring, the contact rods at different locations are always abutted against different contact surfaces of the components. Once the components are placed stably, an electric field box is activated to form an electric field around the box, causing the liquid current inside the box to change from liquid to solid, fixing the position of the contact rods and thus clamping the components.

[0016] Simultaneously, as the contact rod moves into the storage cylinder, it compresses the hydraulic oil inside the storage cylinder, which then flows to other storage cylinders through the interconnecting pipes connected to adjacent storage cylinders. In particular, storage cylinders connected to contact rods located in the recessed areas of the device, where contact rods cannot reach the bottom of the recess, will have more hydraulic oil pressed in, pushing the contact rods at these locations toward the device. This allows the contact rods at these locations to abut against areas of the device that were originally inaccessible, thereby increasing the clamping points between the device and the fixture, improving the clamping effect, and reducing clamping damage.

[0017] Simultaneously, as the contact rod moves into the storage cylinder, the hydraulic oil inside the storage cylinder forces the piston to move away from the storage cylinder. This causes the electrorheological fluid in the movable orifice to enter the connecting orifice under pressure, where it impacts and mixes with the electrorheological fluid entering the connecting orifice from other movable orifices. Finally, it is discharged into the electric field box through the flow orifice, pushing the electrorheological fluid in the electric field box to flow. This causes the electrorheological fluid in the electric field box to flow between the storage cylinder and the contact rod, dispersing and converging, thereby eliminating sedimentation and stratification of the electrorheological fluid in the electric field box and avoiding the performance degradation problem caused by prolonged lack of flow. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0019] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the structural distribution of the present invention;

[0022] Figure 3 This is a schematic diagram of the electric field box structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the electric field box of the present invention;

[0024] Figure 5This is a schematic diagram of the backplate structure of the present invention;

[0025] Figure 6 For the present invention Figure 5 A magnified view of the structure at point A in the middle.

[0026] The components include: 1. Monitoring frame; 2. Crossbeam; 3. Sensor mounting bracket; 4. Slide rail; 5. Hydraulic cylinder; 51. Hydraulic rod; 6. Limiting block; 7. Back plate; 8. Electric field box; 9. Sealing plate; 10. Movable hole; 11. Connecting hole; 12. Flow hole; 13. Piston; 14. Storage cylinder; 15. Contact rod; 151. Inset annular groove; 16. Reciprocating spring; 17. Interconnecting pipe; 18. Limiting ring; 19. Barrier plate; 20. Hanging spring. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. Example 1

[0028] Please see Figures 1 to 2 A force monitoring device for assembling elastic cylindrical pins includes a monitoring frame 1. A crossbeam 2 is fixedly connected to the top center of the monitoring frame 1, and a sensor mounting bracket 3 is fixedly connected to the bottom end of the crossbeam 2. The sensor for monitoring is stably installed on the sensor mounting bracket 3 and makes stable contact with the assembly device clamped by the fixture below. Symmetrical slides 4 are opened on the bottom top plane of the monitoring frame 1. Hydraulic cylinders 5 are fixedly sleeved at both ends of the long side of the slides 4. A hydraulic rod 51 is movably sleeved inside the hydraulic cylinder 5. A limit block 6 is fixedly connected to the end of the hydraulic rod 51 away from the hydraulic cylinder 5. The limit block 6 is movably sleeved in the slides 4. The side wall of the limit block 6 fits against the side wall of the slides 4, and the bottom end of the limit block 6 fits against the bottom end of the slides 4. When the hydraulic cylinder 5 is started, it can drive the limit block to reciprocate linearly under the restriction of the slides 4 through the hydraulic rod 51, thereby driving the fixture to reciprocate linearly and contact and squeeze the assembly devices of different sizes.

[0029] See Figures 1 to 4An electric field box 8 is fixedly connected to the top of the limiting block 6. The electric field box 8 is filled with electrorheological fluid and has wound wires inside. When the wires are energized, they can form an electric field around the electric field box 8, causing the liquid electrorheological fluid to turn into a solid. When the clamp releases the device, the wires will be de-energized, the electric field will disappear, and the solid electrorheological fluid will turn back into a liquid. A back plate 7 is fixedly connected to the end of the electric field box 8 near the hydraulic cylinder 5, and a sealing plate 9 is bolted to the end of the electric field box 8 away from the hydraulic cylinder 5. The electric field box 8 is sealed by the back plate 7 and the sealing plate 9 to prevent leakage of the electrorheological fluid.

[0030] See Figures 4 to 6 A uniformly distributed storage cylinder 14 is fixedly connected to one end of the back plate 7 facing the inside of the electric field box 8. A contact rod 15 is movably sleeved inside the storage cylinder 14. A reciprocating spring 16 is fixedly connected to one end of the contact rod 15 inside the storage cylinder 14. The other end of the contact rod 15 passes through the sealing plate 9 to the outside of the electric field box 8. This allows the outer end of the contact rod 15 to press against the outer surface of the device as it moves closer to the assembly device with the movement of the clamp. As the clamp continues to move, the contact rod 15 moves towards the storage cylinder 14 under the reaction force, compressing the reciprocating spring 16. This causes the contact rod 15 to abut against the device surface under the elastic force of the compressed reciprocating spring 16. Thus, contact rods 15 at different locations abut against the outer surface of the device at different positions. Contact compression can still be performed on the outer surface of irregularly shaped devices. After the electrorheological fluid transforms into a solid state, the position of the moved contact rod 15 is fixed, thereby... The device is clamped. When the electrorheological fluid turns back into a liquid state, the clamp moves away from the device under the drive of the hydraulic rod 51. The compressed reciprocating spring 16 pushes the contact rod 15 to move and reset. The contact rod 15 has evenly distributed recessed annular grooves 151 on its part inside the electric field box 8. The recessed annular grooves 151 do not detach from the electric field box 8, so that when the contact rod 15 reciprocates in the electric field box 8, the recessed annular grooves 151 can scrape the nearby electrorheological fluid, causing the surrounding electrorheological fluid to flow. This agitates the electrorheological fluid to a certain extent, eliminating sedimentation and stratification of the electrorheological fluid in the electric field box and avoiding performance degradation caused by prolonged stagnation of the electrorheological fluid. After the electrorheological fluid becomes solid, the recessed annular grooves 151 will form a fixed connection with the solid electrorheological fluid, hindering the linear reciprocating movement of the contact rod 15, further ensuring that the position of the contact rod 15 remains unchanged. At this time, the device cannot undergo effective displacement. Example 2

[0031] Please see Figures 4 to 6Based on Embodiment 1, an interconnecting pipe 17 is fixedly connected between adjacent storage cylinders 14. The storage cylinders 14 are filled with hydraulic oil. As the contact rod 15 moves into the storage cylinder 14, it squeezes the hydraulic oil in the storage cylinder 14 and flows it to other storage cylinders 14 through the interconnecting pipe 17 connected to the adjacent storage cylinders 14. In particular, more hydraulic oil is pressed into the storage cylinder 14 connected to the contact rod 15 located in the device recess and unable to contact the bottom of the device recess, pushing the contact rod 15 in this location to move towards the device, so that the contact rod 15 can abut against the part of the device that was originally inaccessible. At this time, the reciprocating spring 16 is stretched, thereby increasing the clamping point between the device and the clamp, improving the clamping effect, and reducing clamping damage. In addition, during this process, some contact rods 15 and other contact rods 15 move in opposite directions. At this time, the recessed annular groove 151 on the contact rod 15 pushes the flow direction of the electrorheological fluid in the opposite direction, causing the opposing flow of electrorheological fluid to impact each other, thereby further improving the mixing and agitation effect of the electrorheological fluid.

[0032] When the electrorheological fluid reverts to a liquid state, the clamp moves away from the device under the action of the hydraulic rod 51, and the reciprocating spring 16 stretched here will pull the contact rod 15 to move and reset. Example 3

[0033] Please see Figures 5 to 6Based on Embodiment 2, the back plate 7 has evenly distributed movable holes 10. A connecting hole 11 is formed between the bottoms of adjacent movable holes 10. A vertical flow hole 12 is formed at the center of the connecting hole 11, connecting to the inner cavity of the electric field box 8. This allows the electrorheological fluid in the electric field box 8 to enter the movable holes 10 through the flow hole 12 and the connecting hole 11 when it is in a liquid state, and vice versa. All movable holes 10, especially adjacent movable holes 10, allow the electrorheological fluid in them to contact, mix, and exchange through the connecting hole 11. One end of a single movable hole 10 facing the inner cavity of the electric field box 8 connects to one of the storage cylinders 14. The inner cavity is connected, and a piston 13 is movably sleeved inside the movable hole 10. One end of the piston 13 facing the contact rod 15 is fixedly connected to the end of the reciprocating spring 16 away from the contact rod 15. This allows the contact rod 15 to squeeze the reciprocating spring 16 when it moves into the storage cylinder 14, causing the reciprocating spring 16 to push the piston 13 in the same direction. This causes the piston 13 to squeeze the electrorheological fluid in the movable hole 10 into the connecting hole 11, where it impacts and mixes with the electrorheological fluid entering the connecting hole 11 from other movable holes 10. Finally, the mixture is discharged into the electric field box 8 through the flow hole 12, driving the flow of the electrorheological fluid in the electric field box 8. The electrorheological fluid in the electric field box 8 flows between the storage cylinder 14 and the contact rod 15, dispersing and converging to eliminate sedimentation and stratification of the electrorheological fluid within the electric field box 8. This avoids performance degradation caused by prolonged stagnation of the electrorheological fluid. It is important to note that during this process, when the electrorheological fluid fills the inner cavity of the electric field box 8, the available flow space for the fluid is fixed. At this time, excess hydraulic oil from other storage cylinders 14 is back-pressed into the storage cylinders 14 connected to the contact rod 15 without contact devices. New electrorheological fluid is also pressurized into the movable hole 10 connected to this storage cylinder 14. The injected hydraulic oil applies pressure of opposite direction and same magnitude to the contacting piston 13 and contact rod 15. The pressure of the newly injected electrorheological fluid comes from the pressure provided by other contact rods 15 moving towards piston 13. In other words, the force applied to piston 13 by the injected electrorheological fluid is opposite in direction to the force applied by the hydraulic oil, which will cancel the force applied by the hydraulic oil to piston 13. The contact rod 15 here will move towards the device under the push of the injected hydraulic oil, and piston 13 here will also move towards the device under the push of the injected electrorheological fluid, extending the distance that the contact rod 15 here can move towards the device.

[0034] See Figure 6 Two limiting rings 18 are fixedly sleeved on the side of the inner cavity of the storage cylinder 14 near the back plate 7. The interconnecting pipe 17 is located between the two limiting rings 18, so that when the piston 13 moves toward the storage cylinder 14, it will be blocked by the nearby limiting rings 18 and cannot continue to move. The same applies to the contact rod 15. As a result, the electrorheological fluid in the movable hole 10 will not be connected to the interconnecting pipe 17, and the problem of electrorheological fluid mixing with hydraulic oil will occur. Example 4

[0035] Please see Figure 4 Based on Embodiment 3, hanging springs 20 are fixedly connected to the four corners of the top of the inner cavity of the electric field box 8. A baffle plate 19 is fixedly connected to the bottom of each hanging spring 20. The sidewall of the baffle plate 19 is flush with the inner sidewall of the electric field box 8 and is equipped with a sealing ring. The space above the baffle plate 19 is empty, while the space below it is filled with electrorheological fluid. When the electrorheological fluid in the movable hole 10 is pressed, most of the fluid will be pressed into the space below the baffle plate 19. This pressed fluid will push the baffle plate 19 upwards, causing it to rise and compress the hanging springs 20. This allows most of the fluid to flow between the storage cylinder 14 and the contact rod 15, resulting in dispersion, convergence, and agitation. Since the baffle plate 19 can move upwards, it provides space for the discharge of the electrorheological fluid from the movable hole 10. The storage cylinder 14, which is connected to the contact rod 15 without contact devices, is also affected. Excess hydraulic oil is forced back into other storage cylinders 14, while the amount of electrorheological fluid pressed into the movable hole 10 connected to this storage cylinder 14 will decrease. At this time, the pressed hydraulic oil applies pressure of opposite direction and same magnitude to the contacting piston 13 and contact rod 15. The force applied by the pressed electrorheological fluid to the piston 13 is opposite to the force applied by the hydraulic oil, and can only offset part of the force applied by the hydraulic oil to the piston 13. Only after the hanging spring 20 completely prevents the baffle plate 19 from moving upward can more excess electrorheological fluid be pressed into these movable holes 10, avoiding the problem that most of the contact rods 15 are in contact with the device, resulting in a large amount of electrorheological fluid being forced out of the movable hole 10 and having nowhere to flow. After the clamp releases the device, the hanging spring 20 will push the baffle plate 19 downward to squeeze the electrorheological fluid, which will flow back into the movable hole 10, push the piston 13 to reset, and provide sufficient flow space for the piston to squeeze the electrorheological fluid again.

[0036] It should be noted that during the above process, the lifting of the baffle plate 19 is phased. When the hanging spring 20 is compressed to a certain extent, the downward force applied to the baffle plate 19 will counteract the upward force of the electrorheological fluid. At this time, since some of the contact rods 15 have not yet contacted the device, the electrorheological fluid will be pressed into the movable hole 10 behind these contact rods 15, pushing the piston 13 to move. As the number of contact rods of the contact device gradually increases, the movable hole 10 that can hold the electrorheological fluid gradually decreases. At this time, the baffle plate 19 will move upward again, and the hanging spring 20 will be compressed again until it can no longer be compressed. This phased movement will make the flow of the electrorheological fluid more complex and variable.

Claims

1. A force value monitoring device for elastic cylindrical pin assembly, characterized by, The monitoring rack (1) and four clamps installed on the monitoring rack (1); The clamp comprises a back plate (7), an electric field box (8) connected to one end of the back plate (7), and an enclosing plate (9) connected to one side of the electric field box (8). A plurality of storage barrels (14) are evenly arranged on the end of the back plate (7) facing the electric field box (8). A contact rod (15) is arranged in the storage barrel (14) and protrudes out of the enclosing plate (9) to the outside of the electric field box (8) for clamping the device. One end of the contact rod (15) in the storage barrel (14) is fixedly connected with a reciprocating spring (16) for providing a pressing force to the contact rod (15). The electric field box (8) is filled with electrorheological fluid for fixing the moved contact rod (15). Interconnecting pipes (17) are connected between adjacent storage barrels (14). The storage barrels (14) are filled with hydraulic oil for pressing the squeezed hydraulic oil into the storage barrels (14) connected to the idle contact rod (15). A plurality of movable holes (10) are evenly arranged in the back plate (7). A communication hole (11) is arranged between the bottoms of adjacent movable holes (10). A vertical flow hole (12) is arranged in the center of the communication hole (11) and communicates with the inner cavity of the electric field box (8) to provide a channel for the flow of electrorheological fluid. One end of the movable hole (10) facing the inner cavity of the electric field box (8) communicates with the inner cavity of one of the storage barrels (14). A piston (13) is arranged in the movable hole (10). One end of the piston (13) facing the contact rod (15) is connected with one end of the reciprocating spring (16) away from the contact rod (15) to receive the movement force of the contact rod (15). Two limiting rings (18) are arranged on the side of the inner cavity of the storage barrel (14) close to the back plate (7). The interconnecting pipe (17) is located between the two limiting rings (18) to limit the movement distance of the piston (13) and the contact rod (15).

2. The force monitoring device for elastic cylindrical pin assembly according to claim 1, characterized in that, A cross beam (2) is arranged at the top center of the monitoring rack (1). A sensor mounting rack (3) is arranged at the bottom end of the cross beam (2) to stably mount the monitoring sensor.

3. The force monitoring device for elastic cylindrical pin assembly according to claim 1, wherein A symmetric slide (4) is arranged on the top end plane of the bottom of the monitoring rack (1). Symmetric hydraulic cylinders (5) are arranged at the two ends of the long side of the slide (4). A hydraulic rod (51) is arranged in the hydraulic cylinder (5). A limiting block (6) is connected to one end of the hydraulic rod (51) away from the hydraulic cylinder (5). The limiting block (6) is connected to the bottom end of the electric field box (8) to drive the clamp to move linearly.

4. The force monitoring device for elastic cylindrical pin assembly according to claim 1, wherein, A plurality of inward ring grooves (151) are evenly arranged on the contact rod (15) to stir the surrounding electrorheological fluid and fix the contact rod (15) after the electrorheological fluid solidifies.

5. The force monitoring device for elastic cylindrical pin assembly according to claim 1, wherein, Four hanging springs (20) are arranged at the four corners of the inner cavity top end of the electric field box (8). A blocking plate (19) is fixedly connected to the bottom end of the hanging spring (20) to provide more flow directions and spaces for the electrorheological fluid.

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