A screw testing fixture

Abstract

The application discloses a lead screw detection tool, and aims to solve the inconvenience of lead screw operation parameter detection of an injection molding machine. The application comprises a fixed plate and a movable plate, the movable plate can move to adjust the distance between the fixed plate and the movable plate, a ejection plate is installed between the fixed plate and the movable plate, a lead screw unit to be detected is detachably installed on the fixed plate, the lead screw unit comprises a lead screw, the lead screw is adaptively connected with the ejection plate, a driving unit is installed on the fixed plate, the driving unit drives the lead screw to rotate, thereby driving the ejection plate to move. The lead screw detection tool of the patent application facilitates the detection of the lead screw operation parameters of the injection molding machine, the actual working condition is simulated during detection, the detection data is accurate and reliable; the detection and calibration are performed before the lead screw is installed to the injection molding machine, and the risk caused by the lead screw parameter problem is reduced.

Description

Technical Field

[0001] This invention relates to the field of injection molding machines, and more specifically, to a screw inspection fixture. Background Technology

[0002] In recent years, with the widespread application of high-precision plastic parts and the reduction in manufacturing costs, all-electric injection molding machines, with their superior advantages in energy saving, control, processing, cleanliness, and low noise, will rapidly occupy the plastic machinery market in the next 20 years. This is also the reason for the rapid development of the trend of large machines becoming two-platen and small machines becoming all-electric.

[0003] In the ejector assembly of an all-electric injection molding machine's clamping unit, the conventional transmission scheme is a motor-driven lead screw drive. However, due to space constraints, it is difficult to inspect the relevant geometric dimensions of the ejector assembly while the machine is running. For example, the geometric tolerances of the lead screw, including but not limited to parallelism, perpendicularity, and coaxiality, have a significant impact on actual production. The quality of these dimensions determines the lifespan of the lead screw. During production, after the ejector assembly is installed, it is difficult to accurately measure and evaluate its quality. If there are significant errors in the parallelism or perpendicularity during installation, it can lead to serious problems such as ball screw breakage. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a lead screw testing fixture, which facilitates the testing of the operating parameters of the lead screw used in injection molding machines. The testing simulates actual working conditions, and the test data is accurate and reliable. The testing and calibration are performed before the lead screw is installed in the injection molding machine, reducing the risks caused by lead screw parameter problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a lead screw detection fixture, including a fixed plate and a movable plate, the movable plate being movable to adjust the distance between itself and the fixed plate, an ejector plate being installed between the fixed plate and the movable plate, a lead screw unit to be detected being detachably installed on the fixed plate, the lead screw unit including a lead screw, the lead screw being adapted to and connected to the ejector plate, a drive unit being installed on the fixed plate, the drive unit driving the lead screw to rotate, thereby driving the ejector plate to move.

[0006] During operation, the lead screw unit to be tested is installed on the fixed plate, and the lead screw and ejector plate are assembled in place. Based on the corresponding parameters, the position of the moving plate is adjusted, thereby adjusting the distance between the fixed plate and the moving plate. The drive unit drives the lead screw to rotate, causing the ejector plate to move, simulating actual working conditions. By simulating the actual working conditions of the lead screw using the tooling of this application, various parameters of the lead screw can then be tested. Compared with the actual machine, this working condition offers greater adjustability and lower operational difficulty, enabling precise measurement of the geometric tolerances of parts such as the lead screw.

[0007] The lead screw testing fixture described in this patent application facilitates the testing of lead screw operating parameters for injection molding machines. The testing simulates actual working conditions, resulting in accurate and reliable test data. By performing testing and calibration before the lead screw is installed in the injection molding machine, the risks caused by lead screw parameter issues are reduced.

[0008] Preferably, the movable plate is adapted to connect to the drive screw, one end of which is connected to a handwheel, and the rotation of the handwheel drives the movable plate to move.

[0009] The drive screw is rotated by a handwheel, which in turn moves the moving plate, making operation convenient and reliable.

[0010] Preferably, several tie rods are installed on the fixed plate, and guide holes are provided on the movable plate corresponding to the tie rods. The tie rods are movably connected to the guide holes.

[0011] During the movement of the movable plate, the guide hole and the pull rod work together to ensure the accuracy of the movement position.

[0012] Preferably, the ejector plate is provided with several ejector rods, and the movable plate is provided with through holes corresponding to the ejector rods, so that the ejector rods can pass through the through holes.

[0013] During the movement of the ejector plate, the ejector rod is used to connect the load, which better simulates the actual working conditions.

[0014] Preferably, a number of guide rods are provided on the fixed plate, and corresponding insertion holes are provided on the ejector plate and the guide rods, and the guide rods and insertion holes are movably inserted together.

[0015] The ejector plate moves smoothly and reliably along the guide rod.

[0016] Preferably, a limiting cover is provided at the end of the guide rod to limit the movement of the top plate.

[0017] The limit cover prevents the ejector plate from slipping off the guide rod.

[0018] Preferably, a guide sleeve is installed between the insertion hole and the guide rod, and the guide sleeve is fixedly installed on the top plate.

[0019] The guide sleeve design makes the movement of the ejector plate more precise.

[0020] Preferably, a threaded sleeve is fitted onto the lead screw, and the threaded sleeve is fastened to the ejector plate.

[0021] The screw sleeve is designed to allow the lead screw to rotate and drive the ejector plate to move.

[0022] Preferably, a base is provided below the fixed plate, the fixed plate is securely installed on the base, a roller is installed at the lower end of the movable plate, and a steel belt is provided on the base corresponding to the roller, with the roller supported on the steel belt.

[0023] The fixed plate is securely mounted on the base, and the movable plate is supported on the base by rollers. The structure is simple and the installation is reliable.

[0024] Preferably, the ejector plate is connected to the load plate, and damping plates are installed on both sides of the load plate. Friction plates are set on the movable plate and corresponding to the damping plates. Adjustment plates are installed on the load plate and corresponding to the damping plates. A retaining spring is installed between the adjustment plate and the damping plate. A movable push rod is installed on the load plate. Several connecting rods are hinged between the two adjustment plates and the push rod. The two damping plates are respectively attached to the friction plates. A two-way air pump is installed on the movable plate. The two-way air pump has a piston rod, which is connected to the damping plate. Several air blowing holes are set on the movable plate and corresponding to the lead screw. The air blowing holes are connected to the air outlet of the two-way air pump through pipes.

[0025] During the rotation of the lead screw, which drives the ejector plate to move, the load plate provides a load to the ejector plate, making it closer to the actual working conditions and thus improving the accuracy of the lead screw detection data. The damping plate on the load plate is attached to the friction plate, providing damping through the friction between them. Furthermore, the distance between the adjusting plate and the damping plate can be adjusted, thereby adjusting the magnitude of the friction force, which in turn adjusts the load to meet the needs of different lead screws under different working conditions. During adjustment, moving the push rod moves the adjusting plate via the connecting rod, thereby adjusting the preload of the abutment spring and adjusting the friction force. Simultaneously, the movement of the load plate moves the piston rod, enabling the bidirectional air pump to pump air. Airflow is expelled from the air hole, blowing away debris from the lead screw, ensuring its cleanliness and preventing residual iron wires and iron filings from affecting detection accuracy.

[0026] Compared with the prior art, the beneficial effects of the present invention are: (1) The screw detection fixture facilitates the detection of the operating parameters of the screw used in the injection molding machine. The detection simulates the actual working conditions, and the detection data is accurate and reliable. The detection and calibration are performed before the screw is installed in the injection molding machine, which reduces the risk caused by screw parameter problems. (2) The load size of the ejector plate can be adjusted to meet the load requirements of different screws under different working conditions, which is closer to the actual working conditions and helps to improve the accuracy of detection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the front structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0029] Figure 3 This is a partial structural schematic diagram of the present invention;

[0030] Figure 4 This is a cross-sectional view of Embodiment 1 of the present invention;

[0031] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention;

[0032] Figure 6 This is a schematic diagram of the damping plate connection structure in Embodiment 2 of the present invention;

[0033] Figure 7 This is a schematic diagram of the bidirectional air pump structure according to Embodiment 2 of the present invention;

[0034] In the diagram: 1. Fixed plate, 2. Moving plate, 3. Base, 4. Roller, 5. Steel belt, 6. Drive screw, 7. Handwheel, 8. Ejector plate, 9. Lead screw, 10. Drive motor, 11. Motor bracket, 12. Pad, 13. Connecting seat, 14. Bearing, 15. Pulley, 16. Drive wheel, 17. Tensioner wheel, 18. Transmission belt, 19. Tie rod, 20. Ejector rod, 21. Guide rod, 22. Limit cover, 23. Guide sleeve, 24. Screw sleeve, 25. Load plate, 26. Damping plate. 27. Friction plate; 28. Adjusting plate; 29. ​​Abutment spring; 30. Push rod; 31. Lifting screw sleeve; 32. Threaded section; 33. Locking groove; 34. Locking pin; 35. Connecting rod; 36. Positioning groove; 37. Limiting strip; 38. Two-way air pump; 39. Piston rod; 40. Air blowing hole; 41. Air outlet; 42. Air storage chamber; 43. Air outlet cover; 44. Air inlet; 45. Cylinder body; 46. One-way air inlet valve; 47. Piston; 48. Vent chamber; 49. Annular groove; 50. Sealing ring. Detailed Implementation

[0035] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1: A screw testing fixture (see attached) Figure 1 To be continued Figure 4 The device includes a fixed plate 1 and a movable plate 2. The movable plate can adjust the distance between itself and the fixed plate. A base 3 is located below the fixed plate, and the fixed plate is securely mounted on the base. Two rollers 4 are mounted on the lower end of the movable plate. A steel belt 5 is installed on the base corresponding to the rollers, and the rollers are supported on the steel belt. The movable plate is adapted to connect to a drive screw 6. One end of the drive screw is connected to a handwheel 7. Rotating the handwheel drives the movable plate to move. The drive screw is rotatably mounted on the base.

[0037] An ejector plate 8 is installed between a fixed plate and a movable plate. A lead screw unit to be tested is detachably installed on the fixed plate. The lead screw unit includes a lead screw 9, which is adapted to the ejector plate. A drive unit is installed on the fixed plate, driving the lead screw to rotate, thereby moving the ejector plate. Two lead screw units are installed on the fixed plate. The drive unit includes a drive motor 10. A motor bracket 11 is securely installed on the fixed plate, and the drive motor is mounted on the motor bracket. Mounting slots are provided on the fixed plate corresponding to the lead screw units. A pad 12 is securely installed at the mounting slot position, and the lead screw unit is detachably mounted on the pad. One end of a guide rod is detachably mounted on the pad. The lead screw unit also includes a connecting seat 13. The lead screw is rotatably mounted on the connecting seat, which is detachably connected to the pad. A bearing 14 is installed between the lead screw and the connecting seat. A pulley 15 is installed at the end of the lead screw. A drive wheel 16 is installed on the output shaft of the drive motor. A tension wheel 17 is installed on the fixed plate, and a transmission belt 18 is connected to the drive wheel. Both the pulley and the tension wheel are connected to the transmission belt.

[0038] Several tie rods 19 are mounted on the fixed plate. Guide holes are correspondingly provided on the movable plate and the tie rods, and the tie rods are movably connected to the guide holes. Several ejector rods 20 are mounted on the ejector plate. Through holes are correspondingly provided on the movable plate and the ejector rods, allowing the ejector rods to pass through. Several guide rods 21 are mounted on the fixed plate. Insertion holes are correspondingly provided on the ejector plate and the guide rods, and the guide rods and insertion holes are movably inserted together. Limiting caps 22 are provided at the ends of the guide rods to limit the movement of the ejector plate. Guide sleeves 23 are installed between the insertion holes and the guide rods, and the guide sleeves are fixedly mounted on the ejector plate. Positioning rings are installed at both ends of the guide sleeves on the ejector plate, and the two positioning rings abut against the two ends of the guide sleeves respectively. Threaded sleeves 24 are fitted onto the lead screw, and the threaded sleeves are securely connected to the ejector plate.

[0039] During operation, the lead screw unit to be tested is installed on the fixed plate, and the lead screw and ejector plate are assembled in place. Based on the corresponding parameters, the position of the moving plate is adjusted, thereby adjusting the distance between the fixed plate and the moving plate. The drive unit drives the lead screw to rotate, causing the ejector plate to move, simulating actual working conditions. By simulating the actual working conditions of the lead screw using the tooling of this application, various parameters of the lead screw can then be tested. Compared with the actual machine, this working condition offers greater adjustability and lower operational difficulty, enabling precise measurement of the geometric tolerances of parts such as the lead screw.

[0040] Example 2: A screw testing fixture (see attached) Figure 5 To be continued Figure 7Its structure is similar to that of Embodiment 1, with the main difference being that in this embodiment, the ejector plate is connected to the load plate 25, damping plates 26 are installed on both sides of the load plate, friction plates 27 are provided on the moving plate and corresponding to the damping plates, adjusting plates 28 are installed on the load plate and corresponding to the damping plates, abutment spring 29 is installed between the adjusting plate and the damping plate, a movable push rod 30 is installed on the load plate, a lifting screw sleeve 31 is installed on the load plate and corresponding to the push rod, a threaded section 32 is provided on the push rod, the threaded section is adapted to the lifting screw sleeve, the rotation of the lifting screw sleeve drives the push rod to move, a locking groove 33 is provided on the outer wall of the threaded section, a locking pin 34 is installed on the load plate, the end of the locking pin is inserted into the locking groove, so that the push rod can only move and cannot rotate. Several connecting rods 35 are hinged between the two adjusting plates and the push rod. The two damping plates are respectively attached to the friction plate. Positioning grooves 36 are provided on the load plate and the damping plates respectively. The positioning grooves run through both sides of the load plate. A protrusion for limiting the damping plate is provided on one side of the positioning groove. A protrusion is provided on one side of the damping plate. The protrusion corresponds to the protrusion to prevent the damping plate from detaching from the load plate. The open end of the positioning groove is connected to a limiting strip 37, and the adjusting plate abuts against the limiting strip.

[0041] A bidirectional air pump 38 is mounted on a movable plate. The bidirectional air pump has a piston rod 39 connected to a damping plate. Several air inlets 40 are correspondingly arranged on the movable plate and the lead screw, and these inlets are connected to the air outlet 41 of the bidirectional air pump via pipes. An air storage chamber 42 is correspondingly arranged on the movable plate and the lead screw. An air outlet cover 43 is installed at the end of the air storage chamber, and the air inlets are located on the air outlet cover. An air inlet 44 communicating with the air storage chamber is provided on the surface of the movable plate, and the air outlet of the bidirectional air pump communicates with the air inlet. The bidirectional air pump includes a cylinder 45, with several one-way air inlet valves 46 installed at the top and bottom of the cylinder. A piston 47 is installed inside the cylinder, and a piston rod is fastened to the piston. A venting chamber 48 is provided on the piston, and several one-way air inlet valves communicating with the venting chamber are installed at the top and bottom of the piston. A gap is provided between the outer wall of the piston and the inner wall of the cylinder. An annular groove 49 is provided on the outer wall of the piston, and a sealing ring 50 is installed in the annular groove. The diameter of the sealing ring cross-section is smaller than the width of the annular groove. The piston rod has a tubular structure and communicates with the venting chamber. An air outlet is provided on the piston rod. Other structures are the same as in Embodiment 1.

[0042] During the rotation of the lead screw, which drives the ejector plate to move, the load plate provides a load to the ejector plate, making it closer to the actual working conditions and thus improving the accuracy of the lead screw detection data. The damping plate on the load plate is attached to the friction plate, providing damping through the friction between them. Furthermore, the distance between the adjusting plate and the damping plate can be adjusted, thereby adjusting the magnitude of the friction force, which in turn adjusts the load to meet the needs of different lead screws under different working conditions. During adjustment, moving the push rod moves the adjusting plate via the connecting rod, thereby adjusting the preload of the abutment spring and adjusting the friction force. Simultaneously, the movement of the load plate moves the piston rod, enabling the bidirectional air pump to pump air. Airflow is expelled from the air hole, blowing away debris from the lead screw, ensuring its cleanliness and preventing residual iron wires and iron filings from affecting detection accuracy.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A lead screw detection tooling, characterized by, The utility model provides a kind of detection device for screw rod unit, including fixed plate and moving plate, moving plate can move adjustment and fixed plate between spacing, fixed plate and moving plate between installation ejector plate, fixed plate can detachably install the screw rod unit to be detected, the screw rod unit includes screw rod, screw rod is connected with ejector plate adaptation, fixed plate installs drive unit, drive unit drives screw rod rotation, to move in turn with ejector plate;Ejector plate connects load plate, load plate both sides are equipped with damping plate, moving plate and damping plate correspondingly set friction plate, load plate and damping plate correspondingly install adjusting plate, adjusting plate and damping plate between installation abut spring, load plate is installed and moves the push rod setting, two adjusting plates and push rod are all hinged and connect link, and two damping plates are respectively pasted on friction plate.

2. The detection tool for a lead screw according to claim 1, wherein Moving plate is connected with driving screw, and one end of driving screw is connected with hand wheel, and hand wheel rotation drives moving plate to move.

3. The detection tool for a lead screw as claimed in claim 1, wherein Fixed plate is installed with several pull rods, and moving plate and pull rod correspondingly set guide hole, and pull rod is movably connected with guide hole.

4. The detection tool for a lead screw as claimed in claim 1, wherein Ejector plate is provided with several ejector rods, and moving plate and ejector rod correspondingly set through hole, and ejector rod can pass through through hole.

5. The detection tool for a lead screw as claimed in claim 1, wherein Fixed plate is provided with several guide rods, and ejector plate and guide rod correspondingly set insertion hole, and guide rod and insertion hole are movably inserted together.

6. The detection tool for a lead screw as claimed in claim 5, wherein Limiting cover is arranged at the end of guide rod, and limiting cover limits ejector plate.

7. The detection tool for a lead screw as claimed in claim 5, wherein Guide sleeve is installed between insertion hole and guide rod, and guide sleeve is fixedly installed on ejector plate.

8. The detection tool of any one of claims 1 to 7, wherein, Screw sleeve is adaptedly installed on screw rod, and screw sleeve is tightly connected with ejector plate.

9. A screw testing fixture according to any one of claims 1 to 7, characterized in that, Base is arranged below fixed plate, and fixed plate is tightly installed on base, and roller is installed at the lower end of moving plate, and steel belt is correspondingly arranged on base and roller, and roller is supported on steel belt.

10. The detection tool of any one of claims 1 to 7, wherein, Two-way air pump is installed on moving plate, and piston rod is arranged on two-way air pump, and piston rod is connected with damping plate;Several blowing holes are correspondingly arranged on moving plate and screw rod, and blowing hole is communicated to the gas outlet of two-way air pump through pipeline.

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