Rapid test tool for dynamic balance of inner cylinder of washing machine

Abstract

The invention relates to the technical field of washing machine inner barrel testing, and discloses a washing machine inner barrel dynamic balance rapid testing tool which comprises a base and a roller. One end of a hydraulic cylinder is fixedly connected with a first rack, one side of the first rack is in meshed connection with a connecting gear, and one side of the connecting gear is fixedly connected with a threaded rod; the outer portion of the threaded rod is in threaded connection with a connecting base, the inner side of the connecting base is fixedly connected with a detection ring, the inner side of the detection ring is fixedly connected with two pressure sensing detection assemblies, a second motor is started, a first gear drives a second gear to rotate, the second gear drives a roller to rotate through a rotating shaft, a prism block and a connecting shaft, and then a hydraulic cylinder is started; the hydraulic cylinder drives the first rack to move back and forth, the first rack moves to drive the connecting gear and the threaded rod to rotate, the threaded rod drives the connecting seat to move, and the detection ring drives the pressure sensing detection assembly to move, so that the dynamic balance of the roller can be rapidly tested.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of washing machine inner drum testing, in particular to a rapid testing tool for dynamic balance of washing machine inner drum. BACKGROUND

[0002] In the field of washing machine production and manufacturing, the drum as a core rotating component directly determines the stability, noise level and service life of the washing machine when it is running. If the drum has dynamic balance deviation, periodic radial vibration will occur when it rotates at high speed, which not only causes the machine body to shake and the noise to exceed the standard (the noise can reach more than 70dB in severe cases), but also aggravates the bearing wear, shortens the motor life, and even causes safety hazards such as collision between the drum and the outer cylinder. Therefore, dynamic balance testing of the drum before leaving the factory is a key quality control step in the production process of the washing machine.

[0003] Currently, the dynamic balance testing of the washing machine drum mainly relies on traditional detection equipment and process, but there are many technical bottlenecks in actual application. First, the testing efficiency is low. The traditional dynamic balance testing needs to manually transport the drum to the detection station and manually fix it, which is time-consuming and laborious for single positioning. During the detection process, only a fixed axial position of the drum can be detected. If different areas of the drum need to be covered comprehensively, the drum position needs to be adjusted repeatedly for repeated testing, and the testing time of a single drum is long.

[0004] Therefore, we propose a rapid testing tool for dynamic balance of washing machine inner drum to solve the above problems. SUMMARY

[0005] To solve the technical problems of low testing efficiency, repeated testing by adjusting the drum position multiple times, and long testing time, the present application provides a rapid testing tool for dynamic balance of washing machine inner drum.

[0006] The present application adopts the following technical scheme: a rapid testing tool for dynamic balance of washing machine inner drum, comprising a base and a drum, the top end of the base is fixedly connected with an equipment plate, the outer side of the equipment plate is provided with a second motor, one end of the second motor is fixedly connected with a first gear, one end of the first gear is meshingly connected with a second gear, one side of the second gear is fixedly connected with a rotating shaft, the first gear and the second gear are rotatably connected inside the equipment plate, one end of the drum is fixedly connected with a connecting shaft, one end of the connecting shaft is fixedly connected with a prismatic block, one end of the prismatic block is insertedly connected inside the rotating shaft. The inside of the equipment plate is provided with an inner cavity, the inside of the inner cavity is provided with a hydraulic cylinder, one end of the hydraulic cylinder is fixedly connected with a first rack, one side of the first rack is meshedly connected with a connecting gear, one side of the connecting gear is fixedly connected with a threaded rod, one end of the threaded rod is rotatably connected in the inside of the equipment plate, the outside of the threaded rod is threadedly connected with a connecting seat, the inside of the connecting seat is fixedly connected with a detection ring, the inside of the detection ring is fixedly connected with two pressure sensor detection assemblies.

[0007] Preferably, one end of the base is provided with a first motor, one end of the first motor is fixedly connected with a first screw rod, one end of the first screw rod is threadedly connected with a threaded seat, the top of the threaded seat is fixedly connected with a bottom plate, the top of the bottom plate is fixedly connected with two supporting blocks, and the roller is located in the inside of the supporting blocks.

[0008] Preferably, the inside of the rotating shaft is provided with an electric push rod, one end of the electric push rod is fixedly connected with a connecting rod, both ends of the connecting rod are fixedly connected with a second rack, one side of the second rack is meshedly connected with a transmission gear, one side of the transmission gear is meshedly connected with a third rack, one end of the third rack is fixedly connected with a plug-in block, and one end of the plug-in block is plug-in connected in the inside of the prismatic block.

[0009] Preferably, one end of the rotating shaft is processed with a prismatic groove, and one end of the prismatic block is plug-in connected in the inside of the prismatic groove.

[0010] Preferably, the outside of the prismatic block is processed with two insertion grooves, and the plug-in block is plug-in connected in the inside of the insertion grooves.

[0011] Preferably, one side of the equipment plate is fixedly connected with two guide rods, one end of the two guide rods is fixedly connected with a fixed ring, and one end of the threaded rod is rotatably connected in the inside of the fixed ring.

[0012] Preferably, the outside of the detection ring is fixedly connected with a guide plate, and the guide plate is movably connected outside the guide rod.

[0013] Preferably, the top of the base is processed with a movable groove, and the threaded seat is movably connected in the inside of the movable groove.

[0014] Preferably, the detection ring is movably connected outside the roller, and one end of the pressure sensor detection assembly is contactingly connected with the outside of the roller.

[0015] Compared with the prior art, the present application has the following advantages: In use, this invention involves starting the second motor, which in turn drives the second gear to rotate. The second gear, through a rotating shaft, prism block, and connecting shaft, drives the drum to rotate. Then, the hydraulic cylinder is activated, causing the first rack to reciprocate. The movement of the first rack drives the connecting gear and threaded rod to rotate, which in turn drives the connecting seat to move. The connecting seat then drives the detection ring to move back and forth along the outside of the drum. Simultaneously, the detection ring drives two pressure sensing components to move in contact with each other along the outside of the drum, thus enabling rapid dynamic balance testing of the drum. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connection structure between the base plate and the support block of the present invention; Figure 3 This is a schematic diagram of the internal structure of the device board of the present invention; Figure 4 This is a schematic diagram of the detection ring structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the rotating shaft and the prism block of the present invention; Figure 6 This is a schematic diagram of the internal structure of the rotating shaft of the present invention.

[0017] In the diagram: 1. Base; 2. Roller; 3. First motor; 4. First lead screw; 5. Threaded seat; 6. Base plate; 7. Support block; 8. Movable groove; 9. Equipment plate; 10. Detection ring; 11. Pressure sensor detection assembly; 12. Second motor; 13. First gear; 14. Second gear; 15. Rotating shaft; 16. Connecting shaft; 17. Prism block; 18. Prism groove; 19. Hydraulic cylinder; 20. First rack; 21. Connecting gear; 22. Threaded rod; 23. Connecting seat; 24. Guide rod; 25. Fixing ring; 26. Guide plate; 27. Electric push rod; 28. Connecting rod; 29. ​​Second rack; 30. Transmission gear; 31. Third rack; 32. Insert block; 33. Slot. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0019] Example 1: Please refer to Figure 1 - Figure 6This embodiment provides a rapid testing fixture for dynamic balancing of a washing machine drum, comprising a base and a drum. A device plate is fixedly connected to one end of the top of the base. A second motor is mounted on the outer side of the device plate. A first gear is fixedly connected to one end of the second motor, and a second gear is meshed with one end of the first gear. A rotating shaft is fixedly connected to one side of the second gear. The first and second gears are rotatably connected inside the device plate. A connecting shaft is fixedly connected to one end of the drum, and a prism block is fixedly connected to one end of the connecting shaft. One end of the prism block is plugged into the rotating shaft. The preparation plate has an internal cavity, and a hydraulic cylinder is installed inside the cavity. One end of the hydraulic cylinder is fixedly connected to a first rack. A connecting gear is meshed with one side of the first rack. A threaded rod is fixedly connected to one side of the connecting gear. One end of the threaded rod is rotatably connected to the inside of the equipment plate. A connecting seat is threadedly connected to the outside of the threaded rod. A detection ring is fixedly connected to the inside of the connecting seat. Two pressure sensing detection components are fixedly connected to the inside of the detection ring. The detection ring is movably connected to the outside of the roller. One end of the pressure sensing detection component is in contact with the outside of the roller. When a dynamic balancing test is required on the roller, the prism block at one end of the roller is inserted into the internal limit and fixed of the rotating shaft. Then, the second motor is started. The second motor will drive the first gear to rotate, the first gear will drive the second gear to rotate, the second gear will drive the rotating shaft to rotate, the rotating shaft will drive the prism block to rotate, the prism block will drive the connecting shaft to rotate, and the connecting shaft will drive the roller to rotate. Secondly, the hydraulic cylinder is activated, which drives the first rack to reciprocate. The movement of the first rack drives the connecting gear to rotate, which in turn drives the threaded rod to rotate. The threaded rod then drives the connecting seat to move, which in turn drives the detection ring to move back and forth along the outside of the drum. At the same time, the detection ring drives the two pressure sensing detection components to move in contact with each other along the outside of the drum. This allows for a rapid test of the dynamic balance of the drum. By reciprocating along the drum's axial direction, the dynamic balance of the drum at different axial positions can be comprehensively tested. Compared with traditional fixed-point testing, this method has a wider coverage and more representative test results. The pressure sensing and detection component is an existing technology. Its detection end is designed as an arc-shaped structure that fits the outer surface of the roller, and it has a built-in spring buffer unit. When the detection ring drives the component to move along the outside of the roller in a contact manner, the built-in spring continuously outputs constant elastic pressure to push the detection end of the component to fit tightly against the outer surface of the roller. Even if the roller has minor surface unevenness due to the manufacturing process (such as welding seams or machining dents) or radial runout during rotation, the spring can compensate for the contact gap in real time through its own deformation, ensuring that the detection end and the roller surface always maintain stable contact and avoiding the loss of pressure signal caused by "virtual contact". If the roller has a dynamic imbalance, it will generate periodic radial vibration due to the shift in the center of gravity when rotating at high speed. This vibration is converted into periodic pressure changes on the detection end through the contact point. When the unbalanced side of the roller rotates to the detection end position, it will apply greater pressure to the component. When the unbalanced side moves away from the detection end, the pressure will decrease accordingly, forming a pressure fluctuation cycle synchronized with the roller speed. The component integrates a pressure strain gauge and a Wheatstone bridge circuit, which is responsible for converting mechanical pressure into electrical signals. As the core sensing element, the pressure strain gauge is closely attached to the force-bearing substrate at the detection end. When the detection end is subjected to pressure transmitted by the roller, the strain gauge undergoes slight deformation along with the substrate, and its own resistance value changes proportionally with the degree of deformation (the greater the pressure, the more obvious the deformation, and the greater the change in resistance). The Wheatstone bridge circuit converts the resistance change of the strain gauge into a measurable electrical signal: the four arms of the circuit are connected to the strain gauge and a fixed resistor respectively. When there is no pressure, the bridge is in a balanced state and the output voltage is zero; when the resistance change of the strain gauge breaks the balance of the bridge, the circuit outputs a voltage signal (usually in the millivolt range) corresponding to the pressure change, and the amplitude and frequency of the voltage signal are completely synchronized with the pressure fluctuation amplitude and period of the roller. The converted electrical signal is processed by the built-in filtering and amplification modules of the component and then transmitted to the external control system of the tooling for calculation and processing, so as to more accurately and comprehensively reflect the overall dynamic balance state of the roller.

[0020] Furthermore, a first motor is provided at one end of the base, a first lead screw is fixedly connected to one end of the first motor, a threaded seat is threadedly connected to one end of the first lead screw, a base plate is fixedly connected to the top of the threaded seat, and two support blocks are fixedly connected to the top of the base plate, with the roller located inside the support blocks; During operation, the roller to be tested is first placed on top of the support block. The arc-shaped groove of the support block fits against the outer surface of the roller, providing initial support and positioning. Then, the first motor is started, driving the first lead screw to rotate. Since the threaded seat is threadedly connected to the first lead screw and movably connected within the movable groove of the base, the rotation of the first lead screw is converted into linear motion of the threaded seat along the direction of the movable groove under the limiting guidance of the movable groove. The threaded seat drives the base plate to move synchronously, and the support block on the base plate then pushes the roller towards the shaft, allowing the prism block at one end of the roller to precisely insert into the prism groove of the shaft, preparing for subsequent roller transmission. This module, through the precision of the lead screw transmission and the limiting effect of the movable groove, achieves automatic and precise transfer of the roller to the transmission module. Compared to manual handling and positioning, this method is more time-saving and labor-saving, and offers higher positioning accuracy. Furthermore, an electric push rod is installed inside the rotating shaft. One end of the electric push rod is fixedly connected to a connecting rod. Both ends of the connecting rod are fixedly connected to a second rack. One side of the second rack is meshed with a transmission gear. One side of the transmission gear is meshed with a third rack. One end of the third rack is fixedly connected to an insert block. One end of the insert block is plugged into the interior of the prism block. When the prism block of the roller is inserted into the prism slot of the rotating shaft, the internal shape of the prism slot matches the external shape of the prism block, achieving initial transmission limit and ensuring that the rotating shaft can drive the prism block to rotate synchronously. To further enhance the stability of the connection, the electric push rod inside the rotating shaft is activated. The electric push rod extends and drives the connecting rod to move. The second racks at both ends of the connecting rod move accordingly. The second racks mesh with the transmission gear, converting linear motion into the rotation of the transmission gear. The transmission gear then meshes with the third rack, causing the third rack to drive the insert block to move closer to the prism block. Finally, the insert block is inserted into the slot of the prism block, performing a second limit lock on the prism block. At this time, the second motor is activated, driving the first gear to rotate. The first gear meshes with the second gear, thereby driving the second gear to rotate. The rotating shaft on one side of the second gear rotates accordingly. Under the limit of the prism slot and the prism block, and the locking action of the insert block and the slot, the rotation of the rotating shaft is accurately transmitted to the connecting shaft, ultimately driving the roller to rotate at high speed, providing a power source for dynamic balance testing. Furthermore, a prism groove is machined at one end of the rotating shaft, and one end of the prism block is plugged into the inside of the prism groove. By setting the prism groove, the inside of the prism groove fits with the outside of the prism block, and the prism groove will limit the prism block, so that the rotating shaft can drive the prism block to rotate synchronously. Furthermore, the prism block has two slots on its exterior, and the insert block is plugged into the inside of the slot. When the insert block is inserted into the inside of the slot, the insert block will limit and lock the prism block. Furthermore, two guide rods are fixedly connected to one side of the equipment plate. One end of each guide rod is fixedly connected to a retaining ring, and the other end of the threaded rod is rotatably connected to the inside of the retaining ring. A guide plate is fixedly connected to the outside of the detection ring, and the guide plate is movably connected to the outside of the guide rod. When the connecting seat moves the detection ring, the detection ring will move the guide plate, and the guide plate will move along the outside of the guide rod. The guide rod will limit the movement of the guide plate, thereby keeping the detection ring stable during movement. Furthermore, the top of the base is machined with a movable groove, and the threaded seat is movably connected inside the movable groove. When the threaded seat moves, it will move along the inside of the movable groove, and the movable groove will limit the movement of the threaded seat.

[0021] Working principle: When a dynamic balancing test is required on the roller, the prism block at one end of the roller is inserted into the internal limit and fixed position of the rotating shaft. Then, the second motor is started, which drives the first gear to rotate. The first gear drives the second gear to rotate, which in turn drives the rotating shaft to rotate. The rotating shaft drives the prism block to rotate, which in turn drives the connecting shaft to rotate. The connecting shaft then drives the roller to rotate. Next, the hydraulic cylinder is started, which drives the first rack to reciprocate. The movement of the first rack drives the connecting gear to rotate, which in turn drives the threaded rod to rotate. The threaded rod drives the connecting seat to move, which in turn drives the detection ring to move back and forth along the outside of the roller. At the same time, the detection ring drives the two pressure sensing detection components to move in contact with each other along the outside of the roller, thus enabling a rapid dynamic balancing test of the roller.

[0022] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A rapid testing fixture for dynamic balancing of a washing machine inner drum, comprising a base (1) and a drum (2), characterized in that, The top end of the base (1) is fixedly connected to the equipment plate (9). A second motor (12) is provided on the outside of the equipment plate (9). A first gear (13) is fixedly connected to one end of the second motor (12). A second gear (14) is meshed to one end of the first gear (13). A rotating shaft (15) is fixedly connected to one side of the second gear (14). The first gear (13) and the second gear (14) are rotatably connected inside the equipment plate (9). A connecting shaft (16) is fixedly connected to one end of the roller (2). A prism block (17) is fixedly connected to one end of the connecting shaft (16). One end of the prism block (17) is plugged into the rotating shaft (15). The equipment plate (9) has an inner cavity, and a hydraulic cylinder (19) is installed inside the inner cavity. One end of the hydraulic cylinder (19) is fixedly connected to a first rack (20). A connecting gear (21) is meshed with one side of the first rack (20). A threaded rod (22) is fixedly connected to one side of the connecting gear (21). One end of the threaded rod (22) is rotatably connected to the inside of the equipment plate (9). A connecting seat (23) is threadedly connected to the outside of the threaded rod (22). A detection ring (10) is fixedly connected to the inside of the connecting seat (23). Two pressure sensing detection components (11) are fixedly connected to the inside of the detection ring (10).

2. The rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 1, characterized in that, One end of the base (1) is provided with a first motor (3), one end of the first motor (3) is fixedly connected to a first lead screw (4), one end of the first lead screw (4) is threadedly connected to a threaded seat (5), the top of the threaded seat (5) is fixedly connected to a base plate (6), the top of the base plate (6) is fixedly connected to two support blocks (7), and the roller (2) is located inside the support blocks (7).

3. The rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 1, characterized in that, An electric push rod (27) is provided inside the rotating shaft (15). One end of the electric push rod (27) is fixedly connected to a connecting rod (28). Both ends of the connecting rod (28) are fixedly connected to a second rack (29). A transmission gear (30) is meshed on one side of the second rack (29). A third rack (31) is meshed on one side of the transmission gear (30). One end of the third rack (31) is fixedly connected to a plug (32). One end of the plug (32) is plugged into the interior of the prism block (17).

4. The rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 3, characterized in that, One end of the rotating shaft (15) is machined with a prism groove (18), and one end of the prism block (17) is plugged into the interior of the prism groove (18).

5. A rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 4, characterized in that, The prism block (17) has two slots (33) on its exterior, and the insert block (32) is plugged into the interior of the slots (33).

6. The rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 1, characterized in that, Two guide rods (24) are fixedly connected to one side of the equipment plate (9). One end of the two guide rods (24) is fixedly connected to a fixing ring (25). One end of the threaded rod (22) is rotatably connected inside the fixing ring (25).

7. A rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 6, characterized in that, The detection ring (10) is externally fixedly connected to a guide plate (26), which is movably connected to the outside of the guide rod (24).

8. The rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 2, characterized in that, The top of the base (1) is machined with a movable groove (8), and the threaded seat (5) is movably connected inside the movable groove (8).

9. A rapid testing fixture for dynamic balancing of a washing machine inner drum according to claim 1, characterized in that, The detection ring (10) is movably connected to the outside of the roller (2), and one end of the pressure sensing detection component (11) is in contact with the outside of the roller (2).

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